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/utilities/twilio.py

@@ -0,0 +1,82 @@
+"""Util that calls Twilio."""
+from typing import Any, Dict, Optional
+
+from langchain_core.pydantic_v1 import BaseModel, Extra, root_validator
+from langchain_core.utils import get_from_dict_or_env
+
+
+class TwilioAPIWrapper(BaseModel):
+    """Messaging Client using Twilio.
+
+    To use, you should have the ``twilio`` python package installed,
+    and the environment variables ``TWILIO_ACCOUNT_SID``, ``TWILIO_AUTH_TOKEN``, and
+    ``TWILIO_FROM_NUMBER``, or pass `account_sid`, `auth_token`, and `from_number` as
+    named parameters to the constructor.
+
+    Example:
+        .. code-block:: python
+
+            from langchain_community.utilities.twilio import TwilioAPIWrapper
+            twilio = TwilioAPIWrapper(
+                account_sid="ACxxx",
+                auth_token="xxx",
+                from_number="+10123456789"
+            )
+            twilio.run('test', '+12484345508')
+    """
+
+    client: Any  #: :meta private:
+    account_sid: Optional[str] = None
+    """Twilio account string identifier."""
+    auth_token: Optional[str] = None
+    """Twilio auth token."""
+    from_number: Optional[str] = None
+    """A Twilio phone number in [E.164](https://www.twilio.com/docs/glossary/what-e164) 
+        format, an 
+        [alphanumeric sender ID](https://www.twilio.com/docs/sms/send-messages#use-an-alphanumeric-sender-id), 
+        or a [Channel Endpoint address](https://www.twilio.com/docs/sms/channels#channel-addresses) 
+        that is enabled for the type of message you want to send. Phone numbers or 
+        [short codes](https://www.twilio.com/docs/sms/api/short-code) purchased from 
+        Twilio also work here. You cannot, for example, spoof messages from a private 
+        cell phone number. If you are using `messaging_service_sid`, this parameter 
+        must be empty.
+    """  # noqa: E501
+
+    class Config:
+        """Configuration for this pydantic object."""
+
+        extra = Extra.forbid
+        arbitrary_types_allowed = False
+
+    @root_validator()
+    def validate_environment(cls, values: Dict) -> Dict:
+        """Validate that api key and python package exists in environment."""
+        try:
+            from twilio.rest import Client
+        except ImportError:
+            raise ImportError(
+                "Could not import twilio python package. "
+                "Please install it with `pip install twilio`."
+            )
+        account_sid = get_from_dict_or_env(values, "account_sid", "TWILIO_ACCOUNT_SID")
+        auth_token = get_from_dict_or_env(values, "auth_token", "TWILIO_AUTH_TOKEN")
+        values["from_number"] = get_from_dict_or_env(
+            values, "from_number", "TWILIO_FROM_NUMBER"
+        )
+        values["client"] = Client(account_sid, auth_token)
+        return values
+
+    def run(self, body: str, to: str) -> str:
+        """Run body through Twilio and respond with message sid.
+
+        Args:
+            body: The text of the message you want to send. Can be up to 1,600
+                characters in length.
+            to: The destination phone number in
+                [E.164](https://www.twilio.com/docs/glossary/what-e164) format for
+                SMS/MMS or
+                [Channel user address](https://www.twilio.com/docs/sms/channels#channel-addresses)
+                for other 3rd-party channels.
+        """  # noqa: E501
+        message = self.client.messages.create(to, from_=self.from_number, body=body)
+        return message.sid