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Merge cockroachdb#110418
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110418: rangefeed: shard the rangefeed scheduler r=erikgrinaker a=erikgrinaker

This patch shards the rangefeed scheduler, to reduce contention on the scheduler mutex. Each shard has a separate mutex and worker pool, and processors are assigned round-robin to shards.

The default shard size is 8 workers, which corresponds to 2 CPUs with default settings. This is configurable via the environment variable `COCKROACH_RANGEFEED_SCHEDULER_SHARD_SIZE`.

Resolves cockroachdb#110427.

Epic: none
Release note: None

Co-authored-by: Erik Grinaker <[email protected]>
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craig[bot] and erikgrinaker committed Sep 18, 2023
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