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/partners/huggingface/langchain_huggingface/__init__.py

@@ -0,0 +1,17 @@
+from langchain_huggingface.chat_models import ChatHuggingFace
+from langchain_huggingface.embeddings import (
+    HuggingFaceEmbeddings,
+    HuggingFaceEndpointEmbeddings,
+)
+from langchain_huggingface.llms import (
+    HuggingFaceEndpoint,
+    HuggingFacePipeline,
+)
+
+__all__ = [
+    "ChatHuggingFace",
+    "HuggingFaceEndpointEmbeddings",
+    "HuggingFaceEmbeddings",
+    "HuggingFaceEndpoint",
+    "HuggingFacePipeline",
+]