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/chat_models/huggingface.py

@@ -1,6 +1,8 @@
 """Hugging Face Chat Wrapper."""
+
 from typing import Any, AsyncIterator, Iterator, List, Optional
 
+from langchain_core._api.deprecation import deprecated
 from langchain_core.callbacks.manager import (
     AsyncCallbackManagerForLLMRun,
     CallbackManagerForLLMRun,
@@ -34,6 +36,13 @@ from langchain_community.llms.huggingface_text_gen_inference import (
 DEFAULT_SYSTEM_PROMPT = """You are a helpful, respectful, and honest assistant."""
 
 
+@deprecated(
+    since="0.0.37",
+    removal="0.3",
+    alternative_import=(
+        "from langchain_huggingface.chat_models.huggingface import ChatHuggingFace"
+    ),
+)
 class ChatHuggingFace(BaseChatModel):
     """
     Wrapper for using Hugging Face LLM's as ChatModels.