raft-engine: add the spill-dir config parameter

[LykxSassinator]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Release raft-engine.spill-dir configurations for users who wanna uses multi disks for storing raft logs.

Which TiDB version(s) do your changes apply to? (Required)

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For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• This PR is translated from: raft-engine: add the spill-dir config parameter docs#18981
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-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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[ti-chi-bot]

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[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-20 08:47:42.518250642 +0000 UTC m=+1210132.258674581: ☑️ agreed by hfxsd.
• 2024-10-08 10:15:33.643779639 +0000 UTC m=+954689.063992648: ☑️ agreed by lilin90.

[hfxsd]

/retest

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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• OWNERS [hfxsd]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #18842.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #18843.