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/llms/arcee.py

@@ -0,0 +1,147 @@
+from typing import Any, Dict, List, Optional, Union, cast
+
+from langchain_core.callbacks import CallbackManagerForLLMRun
+from langchain_core.language_models.llms import LLM
+from langchain_core.pydantic_v1 import Extra, SecretStr, root_validator
+from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env
+
+from langchain_community.utilities.arcee import ArceeWrapper, DALMFilter
+
+
+class Arcee(LLM):
+    """Arcee's Domain Adapted Language Models (DALMs).
+
+    To use, set the ``ARCEE_API_KEY`` environment variable with your Arcee API key,
+    or pass ``arcee_api_key`` as a named parameter.
+
+    Example:
+        .. code-block:: python
+
+            from langchain_community.llms import Arcee
+
+            arcee = Arcee(
+                model="DALM-PubMed",
+                arcee_api_key="ARCEE-API-KEY"
+            )
+
+            response = arcee("AI-driven music therapy")
+    """
+
+    _client: Optional[ArceeWrapper] = None  #: :meta private:
+    """Arcee _client."""
+
+    arcee_api_key: Union[SecretStr, str, None] = None
+    """Arcee API Key"""
+
+    model: str
+    """Arcee DALM name"""
+
+    arcee_api_url: str = "https://api.arcee.ai"
+    """Arcee API URL"""
+
+    arcee_api_version: str = "v2"
+    """Arcee API Version"""
+
+    arcee_app_url: str = "https://app.arcee.ai"
+    """Arcee App URL"""
+
+    model_id: str = ""
+    """Arcee Model ID"""
+
+    model_kwargs: Optional[Dict[str, Any]] = None
+    """Keyword arguments to pass to the model."""
+
+    class Config:
+        """Configuration for this pydantic object."""
+
+        extra = Extra.forbid
+        underscore_attrs_are_private = True
+
+    @property
+    def _llm_type(self) -> str:
+        """Return type of llm."""
+        return "arcee"
+
+    def __init__(self, **data: Any) -> None:
+        """Initializes private fields."""
+
+        super().__init__(**data)
+        api_key = cast(SecretStr, self.arcee_api_key)
+        self._client = ArceeWrapper(
+            arcee_api_key=api_key,
+            arcee_api_url=self.arcee_api_url,
+            arcee_api_version=self.arcee_api_version,
+            model_kwargs=self.model_kwargs,
+            model_name=self.model,
+        )
+
+    @root_validator(pre=False)
+    def validate_environments(cls, values: Dict) -> Dict:
+        """Validate Arcee environment variables."""
+
+        # validate env vars
+        values["arcee_api_key"] = convert_to_secret_str(
+            get_from_dict_or_env(
+                values,
+                "arcee_api_key",
+                "ARCEE_API_KEY",
+            )
+        )
+
+        values["arcee_api_url"] = get_from_dict_or_env(
+            values,
+            "arcee_api_url",
+            "ARCEE_API_URL",
+        )
+
+        values["arcee_app_url"] = get_from_dict_or_env(
+            values,
+            "arcee_app_url",
+            "ARCEE_APP_URL",
+        )
+
+        values["arcee_api_version"] = get_from_dict_or_env(
+            values,
+            "arcee_api_version",
+            "ARCEE_API_VERSION",
+        )
+
+        # validate model kwargs
+        if values.get("model_kwargs"):
+            kw = values["model_kwargs"]
+
+            # validate size
+            if kw.get("size") is not None:
+                if not kw.get("size") >= 0:
+                    raise ValueError("`size` must be positive")
+
+            # validate filters
+            if kw.get("filters") is not None:
+                if not isinstance(kw.get("filters"), List):
+                    raise ValueError("`filters` must be a list")
+                for f in kw.get("filters"):
+                    DALMFilter(**f)
+        return values
+
+    def _call(
+        self,
+        prompt: str,
+        stop: Optional[List[str]] = None,
+        run_manager: Optional[CallbackManagerForLLMRun] = None,
+        **kwargs: Any,
+    ) -> str:
+        """Generate text from Arcee DALM.
+
+        Args:
+            prompt: Prompt to generate text from.
+            size: The max number of context results to retrieve.
+            Defaults to 3. (Can be less if filters are provided).
+            filters: Filters to apply to the context dataset.
+        """
+
+        try:
+            if not self._client:
+                raise ValueError("Client is not initialized.")
+            return self._client.generate(prompt=prompt, **kwargs)
+        except Exception as e:
+            raise Exception(f"Failed to generate text: {e}") from e