community[major], core[patch], langchain[patch], experimental[patch]: Create langchain-community (#14463)

Moved the following modules to new package langchain-community in a backwards compatible fashion:

```
mv langchain/langchain/adapters community/langchain_community
mv langchain/langchain/callbacks community/langchain_community/callbacks
mv langchain/langchain/chat_loaders community/langchain_community
mv langchain/langchain/chat_models community/langchain_community
mv langchain/langchain/document_loaders community/langchain_community
mv langchain/langchain/docstore community/langchain_community
mv langchain/langchain/document_transformers community/langchain_community
mv langchain/langchain/embeddings community/langchain_community
mv langchain/langchain/graphs community/langchain_community
mv langchain/langchain/llms community/langchain_community
mv langchain/langchain/memory/chat_message_histories community/langchain_community
mv langchain/langchain/retrievers community/langchain_community
mv langchain/langchain/storage community/langchain_community
mv langchain/langchain/tools community/langchain_community
mv langchain/langchain/utilities community/langchain_community
mv langchain/langchain/vectorstores community/langchain_community
mv langchain/langchain/agents/agent_toolkits community/langchain_community
mv langchain/langchain/cache.py community/langchain_community
mv langchain/langchain/adapters community/langchain_community
mv langchain/langchain/callbacks community/langchain_community/callbacks
mv langchain/langchain/chat_loaders community/langchain_community
mv langchain/langchain/chat_models community/langchain_community
mv langchain/langchain/document_loaders community/langchain_community
mv langchain/langchain/docstore community/langchain_community
mv langchain/langchain/document_transformers community/langchain_community
mv langchain/langchain/embeddings community/langchain_community
mv langchain/langchain/graphs community/langchain_community
mv langchain/langchain/llms community/langchain_community
mv langchain/langchain/memory/chat_message_histories community/langchain_community
mv langchain/langchain/retrievers community/langchain_community
mv langchain/langchain/storage community/langchain_community
mv langchain/langchain/tools community/langchain_community
mv langchain/langchain/utilities community/langchain_community
mv langchain/langchain/vectorstores community/langchain_community
mv langchain/langchain/agents/agent_toolkits community/langchain_community
mv langchain/langchain/cache.py community/langchain_community
```

Moved the following to core
```
mv langchain/langchain/utils/json_schema.py core/langchain_core/utils
mv langchain/langchain/utils/html.py core/langchain_core/utils
mv langchain/langchain/utils/strings.py core/langchain_core/utils
cat langchain/langchain/utils/env.py >> core/langchain_core/utils/env.py
rm langchain/langchain/utils/env.py
```

See .scripts/community_split/script_integrations.sh for all changes

libs/community/langchain_community/document_loaders/obs_file.py

@@ -0,0 +1,105 @@
+# coding:utf-8
+
+import os
+import tempfile
+from typing import Any, List, Optional
+
+from langchain_core.documents import Document
+
+from langchain_community.document_loaders.base import BaseLoader
+from langchain_community.document_loaders.unstructured import UnstructuredFileLoader
+
+
+class OBSFileLoader(BaseLoader):
+    """Load from the `Huawei OBS file`."""
+
+    def __init__(
+        self,
+        bucket: str,
+        key: str,
+        client: Any = None,
+        endpoint: str = "",
+        config: Optional[dict] = None,
+    ) -> None:
+        """Initialize the OBSFileLoader with the specified settings.
+
+        Args:
+            bucket (str): The name of the OBS bucket to be used.
+            key (str): The name of the object in the OBS bucket.
+            client (ObsClient, optional): An instance of the ObsClient to connect to OBS.
+            endpoint (str, optional): The endpoint URL of your OBS bucket. This parameter is mandatory if `client` is not provided.
+            config (dict, optional): The parameters for connecting to OBS, provided as a dictionary. This parameter is ignored if `client` is provided. The dictionary could have the following keys:
+                - "ak" (str, optional): Your OBS access key (required if `get_token_from_ecs` is False and bucket policy is not public read).
+                - "sk" (str, optional): Your OBS secret key (required if `get_token_from_ecs` is False and bucket policy is not public read).
+                - "token" (str, optional): Your security token (required if using temporary credentials).
+                - "get_token_from_ecs" (bool, optional): Whether to retrieve the security token from ECS. Defaults to False if not provided. If set to True, `ak`, `sk`, and `token` will be ignored.
+
+        Raises:
+            ValueError: If the `esdk-obs-python` package is not installed.
+            TypeError: If the provided `client` is not an instance of ObsClient.
+            ValueError: If `client` is not provided, but `endpoint` is missing.
+
+        Note:
+            Before using this class, make sure you have registered with OBS and have the necessary credentials. The `ak`, `sk`, and `endpoint` values are mandatory unless `get_token_from_ecs` is True or the bucket policy is public read. `token` is required when using temporary credentials.
+
+        Example:
+            To create a new OBSFileLoader with a new client:
+            ```
+            config = {
+                "ak": "your-access-key",
+                "sk": "your-secret-key"
+            }
+            obs_loader = OBSFileLoader("your-bucket-name", "your-object-key", config=config)
+            ```
+
+            To create a new OBSFileLoader with an existing client:
+            ```
+            from obs import ObsClient
+
+            # Assuming you have an existing ObsClient object 'obs_client'
+            obs_loader = OBSFileLoader("your-bucket-name", "your-object-key", client=obs_client)
+            ```
+
+            To create a new OBSFileLoader without an existing client:
+            ```
+            obs_loader = OBSFileLoader("your-bucket-name", "your-object-key", endpoint="your-endpoint-url")
+            ```
+        """  # noqa: E501
+        try:
+            from obs import ObsClient
+        except ImportError:
+            raise ImportError(
+                "Could not import esdk-obs-python python package. "
+                "Please install it with `pip install esdk-obs-python`."
+            )
+        if not client:
+            if not endpoint:
+                raise ValueError("Either OBSClient or endpoint must be provided.")
+            if not config:
+                config = dict()
+            if config.get("get_token_from_ecs"):
+                client = ObsClient(server=endpoint, security_provider_policy="ECS")
+            else:
+                client = ObsClient(
+                    access_key_id=config.get("ak"),
+                    secret_access_key=config.get("sk"),
+                    security_token=config.get("token"),
+                    server=endpoint,
+                )
+        if not isinstance(client, ObsClient):
+            raise TypeError("Client must be ObsClient type")
+        self.client = client
+        self.bucket = bucket
+        self.key = key
+
+    def load(self) -> List[Document]:
+        """Load documents."""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            file_path = f"{temp_dir}/{self.bucket}/{self.key}"
+            os.makedirs(os.path.dirname(file_path), exist_ok=True)
+            # Download the file to a destination
+            self.client.downloadFile(
+                bucketName=self.bucket, objectKey=self.key, downloadFile=file_path
+            )
+            loader = UnstructuredFileLoader(file_path)
+            return loader.load()