Add HuggingFace chat model integration examples (#1522)

**Type:** Update existing documentation

## Related issues/PRs  
Related to langchain-ai/langchain#28226

## Description
Adds HuggingFace chat model integration examples to the
chat-model-tabs.mdx snippet file.

**Includes:**
- Installation instructions for langchain[huggingface]
- init_chat_model example with HuggingFace provider
- Direct model class usage with HuggingFaceEndpoint and ChatHuggingFace
- Uses microsoft/Phi-3-mini-4k-instruct as the example model

This provides users with a clear example of how to use init_chat_model
with HuggingFace models, addressing the documentation gap mentioned in
issue #28226.

Author: akhilreddy097

src/snippets/chat-model-tabs.mdx

@@ -134,5 +134,43 @@
             model = ChatBedrock(model="anthropic.claude-3-5-sonnet-20240620-v1:0")
             ```
         </CodeGroup>
+
+<Tab title="HuggingFace">
+    👉 Read the [HuggingFace chat model integration docs](/oss/python/integrations/chat/huggingface/)
+
+    ```shell
+    pip install -U "langchain[huggingface]"
+    ```
+
+    <CodeGroup>
+        ```python init_chat_model
+        import os
+        from langchain.chat_models import init_chat_model
+
+        os.environ["HUGGINGFACEHUB_API_TOKEN"] = "hf_..."
+
+        model = init_chat_model(
+            "microsoft/Phi-3-mini-4k-instruct",
+            model_provider="huggingface",
+            temperature=0.7,
+            max_tokens=1024,
+        )
+        ```
+
+        ```python Model Class
+        import os
+        from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint
+
+        os.environ["HUGGINGFACEHUB_API_TOKEN"] = "hf_..."
+
+        llm = HuggingFaceEndpoint(
+            repo_id="microsoft/Phi-3-mini-4k-instruct",
+            temperature=0.7,
+            max_length=1024,
+        )
+        model = ChatHuggingFace(llm=llm)
+        ```
+    </CodeGroup>
+</Tab>
     </Tab>
 </Tabs>