huggingface: init package (#21097)

First Pr for the langchain_huggingface partner Package

- Moved some of the hugging face related class from `community` to the
new `partner package`

Still needed :
- Documentation
- Tests
- Support for the new apply_chat_template in `ChatHuggingFace`
- Confirm choice of class to support for embeddings witht he
sentence-transformer team.

cc : @efriis

---------

Co-authored-by: Cyril Kondratenko <kkn1993@gmail.com>
Co-authored-by: Erick Friis <erick@langchain.dev>

libs/community/langchain_community/llms/huggingface_endpoint.py

@@ -2,6 +2,7 @@ import json
 import logging
 from typing import Any, AsyncIterator, Dict, Iterator, List, Mapping, Optional
 
+from langchain_core._api.deprecation import deprecated
 from langchain_core.callbacks import (
     AsyncCallbackManagerForLLMRun,
     CallbackManagerForLLMRun,
@@ -21,6 +22,11 @@ VALID_TASKS = (
 )
 
 
+@deprecated(
+    since="0.0.37",
+    removal="0.3",
+    alternative_import="from langchain_huggingface.llms import HuggingFaceEndpoint",
+)
 class HuggingFaceEndpoint(LLM):
     """
     HuggingFace Endpoint.