core[patch]: introduce ToolMessage.status (#24628)

Anthropic models (including via Bedrock and other cloud platforms)
accept a status/is_error attribute on tool messages/results
(specifically in `tool_result` content blocks for Anthropic API). Adding
a ToolMessage.status attribute so that users can set this attribute when
using those models

libs/partners/anthropic/langchain_anthropic/chat_models.py

@@ -127,6 +127,7 @@ def _merge_messages(
                             "type": "tool_result",
                             "content": curr.content,
                             "tool_use_id": curr.tool_call_id,
+                            "is_error": curr.status == "error",
                         }
                     ]
                 )