Add Blocking Sorted Set Pop Commands
Motivation: To be a comprehensive library, all commands should be implemented, even if they are highly discouraged. Sorted Set's collection of commands were missing `bzpopmin` and `bzpopmax`. Modifications: `bzpopmin` and `bzpopmax` are supported with defaults and overloads for an easier API. `RedisClient.channel` is now `internal` to have access during testing for bypassing normal guards for closing connections. Result: Users now have access to `bzpopmin` and `bzpopmax` commands.
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