distribute-table: support to scatter the region distribution of the given table and engine

[qiancai]

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• [x] v9.0 (TiDB 9.0 versions)
• [ ] v8.5 (TiDB 8.5 versions)
• [ ] v8.4 (TiDB 8.4 versions)
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• This PR is translated from: https://github.com/pingcap/docs-cn/pull/19534
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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-03-10 06:27:50.790534677 +0000 UTC m=+164426.396063599: :ballot_box_with_check: agreed by Oreoxmt.

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[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #21883.