[NEW] Consolidate wait states

[PingXie]

I agree. I'm saying we already have the notion that a client is blocked with a pending command, that can get re-executed once the blocking is done. (That is how the normal command blocking works). The blocking mechanic is functionally the same as the other wait (wait for a replack from k replicas then unblock).

Originally posted by @madolson in https://github.com/valkey-io/valkey/pull/245#discussion_r1588610039