chore: add_stream_external_toolcall_support

[fengju0213]

Description

Problem
When using ChatAgent with stream=True and external tools (tools defined in external_tools but not executable by the agent), the Assistant's tool call request message was not being recorded in the chat_history.

• In non-streaming mode, the agent records the tool call request before exiting the step.
• In streaming mode, the agent skipped both the execution and the recording of the message for external tools, resulting in missing conversation history.

Solution
Modified _execute_tool_from_stream_data in camel/agents/chat_agent.py to:

1. Check if a tool call corresponds to an external tool.
2. If yes, explicitly record the Assistant's message (containing the tool call arguments) to chat_history.
3. Maintain the existing behavior of NOT executing the external tool and returning None.

Effect
This ensures consistency between streaming and non-streaming modes, guaranteeing that the chat history correctly reflects the model's intent to call an external tool regardless of the streaming configuration.

Checklist

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• I have linked this PR to an issue using the Development section on the right sidebar or by adding Fixes #issue-number in the PR description (required)
• I have checked if any dependencies need to be added or updated in pyproject.toml and uv lock
• I have updated the tests accordingly (required for a bug fix or a new feature)
• I have updated the documentation if needed:
• I have added examples if this is a new feature

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[Wendong-Fan]

hey @fengju0213 , seems this pr contains change from other commits, please clean the pr

[waleedalzarooni]

Hey @fengju0213, in case this got lost in your inbox would you mind removing the unnecessary file changes so we can review.