Add Detailed Streaming to the Tool Agent

[jonSuits]

Description
This PR adds a new feature to the Tool Agent that enables detailed streaming of intermediate steps during agent execution. This provides more visibility into the agent's reasoning process, tool usage, and decision-making.

Changes

• Added a new "Enable Detailed Streaming" option in the Tool Agent's additional parameters
• Integrated a new CustomStreamingHandler to stream detailed execution traces
• Configured the handler to use a consistent agent_trace event type with step information
• Added support for streaming various event types:

1. LLM operations (start/end)
2. Tool invocations (start/end/error)
3. Chain operations (start/end)
4. Agent actions
5. Agent thinking/reasoning

How to Use
Enable the "Detailed Streaming" option in the Tool Agent's additional parameters
The agent will now stream detailed execution information with the event type agent_trace
Each event includes a step field indicating the type of operation (e.g., "tool_start", "llm_end")
Client applications can listen for these events to provide a more detailed UI experience

Benefits
Enhanced user experience by showing intermediate steps
Ability to improve the UI to show the steps of execution and reasoning

Testing
Tested with various tool combinations to ensure proper event streaming
Verified that the feature can be toggled on/off without affecting normal operation
Confirmed that the detailed streaming works with all supported LLM providers
This enhancement provides developers with deeper insights into agent execution while maintaining backward compatibility with existing implementations.

[HenryHengZJ]

@jonSuits can you grant me permission to make changes?

[jonSuits]

@HenryHengZJ Granted, Thanks

[HenryHengZJ]

still unable to edit:

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork

[HenryHengZJ]

ah okay, it works now

[jonSuits]

Hey @HenryHengZJ
Any feedback or blocker on this?

[HenryHengZJ]

should be good to merge, thanks @jonSuits !