RateLimiterRedis: track redis client connection state for faster response
In case of RateLimiterRedis if underlying client connection is closed, limiter still trying to call Lua script before falling back to insuranceLimiter. As result, very long response time even with in-memory insuranceLimiter.

Possible solution: track state of redis client connection and immediately throw Error to use insuranceLimiter until connection is established again.