m3db / m3cluster / 1741

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[kv] Support watch start revision in watch store (#231)

Some use cases require specifying the start revision of a watch request.
Since our only use case so far needs the start revision at a store level
as opposed to on a per-watch basis, this PR implements watch revision
support at the store level.

This modifies the underlying watch manager to retry a watch with a valid
revision if the start revision requested has been compacted.

Includes tests to make sure that we can safely specify a start revision
that has been compacted or one that is in the future with no issues.

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