feat(config): support configure storage LRU-cache shard by default

[Little-Wallace]

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What's changed and what's your intention?

Configure number of LRU-shard by user.

Checklist

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[lmatz]

http://metabase.risingwave-cloud.xyz/question/9236-nexmark-q15-blackhole-4x-medium-1cn-affinity-avg-source-output-rows-per-second-rows-s-history-thtb-2763?start_date=2024-01-04

seems no improvement, although the drop in performance may be also explained by recent changes on main, not necessarily caused by this PR.

[hzxa21]

LGTM

[Li0k]

We can revert the shared buffer memory change and merge the shared num config part first, thanks

[lmatz]

We can revert the shared buffer memory change and merge the shared num config part first, thanks

tend to agree with this, if anything goes wrong, make the revert easier,
rest LGTM

[MrCroxx]

LGTM