community: add request_timeout and max_retries to ChatAnthropic (#19402)

This PR make `request_timeout` and `max_retries` configurable for
ChatAnthropic.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: Erick Friis <erick@langchain.dev>

libs/partners/anthropic/langchain_anthropic/chat_models.py

@@ -244,7 +244,11 @@ class ChatAnthropic(BaseChatModel):
     """Total probability mass of tokens to consider at each step."""
 
     default_request_timeout: Optional[float] = Field(None, alias="timeout")
-    """Timeout for requests to Anthropic Completion API. Default is 600 seconds."""
+    """Timeout for requests to Anthropic Completion API."""
+
+    # sdk default = 2: https://github.com/anthropics/anthropic-sdk-python?tab=readme-ov-file#retries
+    max_retries: int = 2
+    """Number of retries allowed for requests sent to the Anthropic Completion API."""
 
     anthropic_api_url: str = "https://api.anthropic.com"
 
@@ -286,16 +290,23 @@ class ChatAnthropic(BaseChatModel):
             or "https://api.anthropic.com"
         )
         values["anthropic_api_url"] = api_url
-        values["_client"] = anthropic.Client(
-            api_key=api_key,
-            base_url=api_url,
-            default_headers=values.get("default_headers"),
-        )
-        values["_async_client"] = anthropic.AsyncClient(
-            api_key=api_key,
-            base_url=api_url,
-            default_headers=values.get("default_headers"),
-        )
+        client_params = {
+            "api_key": api_key,
+            "base_url": api_url,
+            "max_retries": values["max_retries"],
+            "default_headers": values.get("default_headers"),
+        }
+        # value <= 0 indicates the param should be ignored. None is a meaningful value
+        # for Anthropic client and treated differently than not specifying the param at
+        # all.
+        if (
+            values["default_request_timeout"] is None
+            or values["default_request_timeout"] > 0
+        ):
+            client_params["timeout"] = values["default_request_timeout"]
+
+        values["_client"] = anthropic.Client(**client_params)
+        values["_async_client"] = anthropic.AsyncClient(**client_params)
         return values
 
     def _format_params(