Aioredis-cluster

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Rework PubSub and fix race conditions ([27](https://github.com/DriverX/aioredis-cluster/pull/27))

- add `aioredis_cluster.aioredis.stream` module
- rework PubSub command execution flow for prevent race conditions on spontaneously server channels unsubscribe push
- make fully dedicated `RedisConnection` implementation for cluster
- `RedisConnection` once entered in PubSub mode was never exit in them, because is too hard handle spontaneously unsubscribe events from Redis with simultaneously `(P|S)UNSUBSCRIBE` manually calls
- fully rewrite handling PUB/SUB replies/events
- for `Cluster`, `RedisConnection` and `ConnectionsPool` `in_pubsub` indicates flag when connector have in pubsub mode connections instead number of PUB/SUB channels
- add key slot handling for sharded PubSub channels in non-cluster dedicate `RedisConnection`
- fix and improve legacy `aioredis` tests
- improve support for py3.12
- improve support for Redis 7.2

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* fix stuck `aioredis.Connection` socket reader routine for sharded PUB/SUB when cluster reshard and Redis starts respond `MOVED` error on `SSUBSCRIBE` commands [24](https://github.com/DriverX/aioredis-cluster/pull/24)

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* improve connection creation timeout
* do not lose connection in Pool while execute PING probe
* respect Pool.minsize in idle connections detector
* shuffle startup nodes for obtain cluster state

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* add support [Sharded PUB/SUB](https://redis.io/docs/manual/pubsub/#sharded-pubsub)
* new methods and properties `spublish`, `ssubscribe`, `sunsubscribe`, `pubsub_shardchannels`, `pubsub_shardnumsub`, `sharded_pubsub_channels`
* drop support Python 3.6, 3.7
* add support Python 3.11
* idle connections detection in connections pool
* change acquire connection behaviour from connection pool. Now connection acquire and release to pool by LIFO way for better idle connection detection
* deprecated `state_reload_frequency` option from `create_cluster` factory was removed

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* fix bypass `username` argument for pool creation

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* add support Redis 6 `AUTH` command with username
* factories `create_cluster`, `create_redis_cluster`, `aioredis_cluster.aioredis.create_connection` now support `username` argument
* add `auth_with_username` method for `AbcConnection`, `AbcPool` and impementations