tikv: enable async-io by setting `raftstore.store-io-pool-size == 1` as default.

[LykxSassinator]

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• [x] master (the latest development version)
• [x] v8.0 (TiDB 8.0 versions)
• [ ] v7.6 (TiDB 7.6 versions)
• [ ] v7.5 (TiDB 7.5 versions)
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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): issue: https://github.com/tikv/tikv/issues/16614, tikv-pr: https://github.com/tikv/tikv/pull/16615

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[ti-chi-bot[bot]]

Hi @LykxSassinator. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[LykxSassinator]

/cc @qiancai

[qiancai]

Hi @LykxSassinator, may I know whether this change is introduced starting from TiDB v8.0?

[LykxSassinator]

Hi @LykxSassinator, may I know whether this change is introduced starting from TiDB v8.0?

Yep

[easonn7]

/approve

[LykxSassinator]

/cc @glorv

[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-03-12 10:03:17.748869501 +0000 UTC m=+766224.771115889: :ballot_box_with_check: agreed by qiancai.
• 2024-03-18 08:14:32.924346596 +0000 UTC m=+1278099.946592969: :ballot_box_with_check: agreed by lilin90.

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: easonn7, qiancai

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[qiancai]

/retest