Fixed potential race condition between call_later() and run_forever()

[vladvildanov]

Description of change

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PR fixes a race condition between loop.call_later() and loop.run_forever() methods, so the renewal task is scheduled before the event loop is actually running

[Copilot]

Pull request overview

This PR fixes a potential race condition in the token manager's start() method that could occur when scheduling callbacks before the event loop thread was fully initialized. The fix improves thread-safety by using proper synchronization primitives and thread-safe scheduling methods.

Key Changes:

• Replaced asyncio.Event with threading.Event for cross-thread synchronization to properly coordinate between the main thread and event loop thread
• Changed from loop.call_later() to loop.call_soon_threadsafe() for thread-safe callback scheduling
• Simplified the _renew_token() method signature by removing the init_event parameter and handling initialization signaling through a wrapper function

Comments suppressed due to low confidence (1)

redis/auth/token_manager.py:310

• The _renew_token method signature has been updated to remove the init_event parameter, but the async version _renew_token_async at line 310 still retains this parameter. This creates an inconsistency between the two methods. For consistency and maintainability, consider whether _renew_token_async should also be updated to remove the init_event parameter if it's no longer needed, or document why the async version still requires it.

    ):
        """

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[petyaslavova]

LGTM.