Python: Add BaseAgent implementation for GitHub Copilot SDK (#3404)
* Added GithubCopilotAgent
* Fixed errors
* Updated examples
* Updated naming and tests
* Resolved comments and more tests
* Updated tool handling
* Updated tool handling
* Small fixes
* Removed default permission handler
* Resolved comments
* Updated positional args
* Updated docstrings
* Small fixes and more examples
* Added example with MCP
Dmytro Struk