WIP: Simplify misk-redis implementation

[keeferrourke]

...by deferring to RealPipelinedRedis.

Follow up for https://github.com/cashapp/misk/pull/3195.

This change deduplicates a lot of logic between RealRedis and RealPipelinedRedis, by always pipelining commands.

This incurs a little overhead since we have to create, sync, and close a pipeline every time (even for just one command), but significantly simplifies the client. I also removed the old timing proxy, so hopefully that compensates for the added overhead of the pipelines.

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I recommend reviewing this change commit-by-commit.