Use sync redis client to determine prod mode worker number and add sanity check

[martinxu9]

Summary

• Use sync redis client to determine prod mode worker number and add sanity check.
• Redis async connection tries to acquire the lock when initializing. In python 3.8 and 3.9, a loop argument was not passed when acquiring lock and fails to find the event loop. From python 3.10, loop was removed and the asyncio APIs are simplified.

Tests

• Using python 3.8 or 3.9 and run simple apps such as counter: REDIS_URL='redis://localhost:6379' reflex run --env prod, the app crashes. With this fix, the app no longer crashes.