community[minor]: add chat model llamacpp (#22589)

- **PR title**: [community] add chat model llamacpp


- **PR message**:
- **Description:** This PR introduces a new chat model integration with
llamacpp_python, designed to work similarly to the existing ChatOpenAI
model.
      + Work well with instructed chat, chain and function/tool calling.
+ Work with LangGraph (persistent memory, tool calling), will update
soon

- **Dependencies:** This change requires the llamacpp_python library to
be installed.
    
@baskaryan

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

docs/scripts/model_feat_table.py

@@ -112,6 +112,13 @@ CHAT_MODEL_FEAT_TABLE = {
         "package": "langchain-community",
         "link": "/docs/integrations/chat/edenai/",
     },
+    "ChatLlamaCpp": {
+        "tool_calling": True,
+        "structured_output": True,
+        "local": True,
+        "package": "langchain-community",
+        "link": "/docs/integrations/chat/llamacpp",
+    },
 }