Added Function Call feature and Rendering quations for File Search

[renyuantime]

Summary

This PR adds the "Function Call" feature to the assistant. It allows users to register and implement custom functions in the OpenAI system.

Changes Implemented:

1. Function Call Logic:

   • Implemented logic for retrieving function calls from the system.
   • Submitting function call results back to the agents for processing.
   • Displays function call inputs and outputs within the system interface.

2. File Search Tool Enhancements:

   • Implemented rendering quotations for file search tool.

3. README Update:

   • Updated the README to document how the function call feature works.

How to Test

1. Register a new function in OpenAI’s Playground.
2. Map the function in the function_map attribute.
3. Implement the function in the EventHandler class.

Related Issues:

• Closes The repo doesn't support function calls #2: Adds support for Azure OpenAI Assistants with function calling.
• Closes How to make it compatible with Azure OpenAI Assistants + Function Calling? #1: Implements function call logic and results display.

[renyuantime]

Hi @willydouhard， could you review my pull request? I added function call feature.

[rajavemuri]

Hi @renyuantime thanks for this. It was really helpful. I see it is missing handling or error in the on_event. Maybe handling thread.run.step.failed and thread.run.failed events and raising an error would be useful