tikv: add new dynamic configure for flow-control

[glorv]

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What is changed, added or deleted? (Required)

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: tikv: add new dynamic configure for flow-control docs#18814
• 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]

[LGTM Timeline notifier]

Timeline:

• 2024-09-10 03:30:53.117767077 +0000 UTC m=+327122.858191017: ☑️ agreed by Oreoxmt.
• 2024-10-16 07:34:53.162238443 +0000 UTC m=+429290.311148269: ☑️ agreed by qiancai.

[Oreoxmt]

/approve
/unhold

[ti-chi-bot]

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