add better error logs for when dill or pickle fail

[adhami3310]

No description provided.

[greptile-apps]

PR Summary

Enhanced error handling and debugging for state serialization in Reflex, particularly focusing on pickle/dill failures, with Python 3.11+ optimizations.

• Added debug_failed_pickles function in reflex/istate/__init__.py for recursive inspection of unpicklable objects
• Improved process method type safety in reflex/app.py from AsyncIterator to more specific AsyncGenerator
• Added contextlib.aclosing wrapper in app.py for proper generator cleanup
• Moved HANDLED_PICKLE_ERRORS constant to reflex.istate module for better organization
• Added pre-computed schema separation from serialization step in state.py for clearer error messages

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[codspeed-hq]

CodSpeed Performance Report

Merging #5502 will not alter performance

_{Comparing add-better-error-logs-for-when-dill-or-pickle-fail (c8179b9) with main (7b4df17)}

Summary

✅ 8 untouched benchmarks

[masenf]

This is awesome!