Standardized openai init params (#21739)

## Patch Summary
community:openai[patch]: standardize init args

## Details
I made changes to the OpenAI Chat API wrapper test in the Langchain
open-source repository

- **File**: `libs/community/tests/unit_tests/chat_models/test_openai.py`
- **Changes**:
  - Updated `max_retries` with Pydantic Field
  - Updated the corresponding unit test
- **Related Issues**: #20085
  - Updated max_retries with Pydantic Field, updated the unit test.

---------

Co-authored-by: JuHyung Son <sonju0427@gmail.com>

libs/community/langchain_community/chat_models/openai.py

@@ -1,4 +1,5 @@
 """OpenAI chat wrapper."""
+
 from __future__ import annotations
 
 import logging
@@ -217,7 +218,7 @@ class ChatOpenAI(BaseChatModel):
     )
     """Timeout for requests to OpenAI completion API. Can be float, httpx.Timeout or 
         None."""
-    max_retries: int = 2
+    max_retries: int = Field(default=2)
     """Maximum number of retries to make when generating."""
     streaming: bool = False
     """Whether to stream the results or not."""

libs/community/tests/unit_tests/chat_models/test_openai.py

@@ -1,6 +1,7 @@
 """Test OpenAI Chat API wrapper."""
+
 import json
-from typing import Any
+from typing import Any, List
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -17,10 +18,19 @@ from langchain_community.chat_models.openai import ChatOpenAI
 
 @pytest.mark.requires("openai")
 def test_openai_model_param() -> None:
-    llm = ChatOpenAI(model="foo", openai_api_key="foo")  # type: ignore[call-arg]
-    assert llm.model_name == "foo"
-    llm = ChatOpenAI(model_name="foo", openai_api_key="foo")  # type: ignore[call-arg]
-    assert llm.model_name == "foo"
+    test_cases: List[dict] = [
+        {"model_name": "foo", "openai_api_key": "foo"},
+        {"model": "foo", "openai_api_key": "foo"},
+        {"model_name": "foo", "api_key": "foo"},
+        {"model_name": "foo", "openai_api_key": "foo", "max_retries": 2},
+    ]
+
+    for case in test_cases:
+        llm = ChatOpenAI(**case)
+        assert llm.model_name == "foo", "Model name should be 'foo'"
+        assert llm.openai_api_key == "foo", "API key should be 'foo'"
+        assert hasattr(llm, "max_retries"), "max_retries attribute should exist"
+        assert llm.max_retries == 2, "max_retries default should be set to 2"
 
 
 def test_function_message_dict_to_function_message() -> None: