sql: Add placement columns for show table regions

[lcwangchao]

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

• This PR is translated from: sql: Add placement columns for show table regions docs-cn#10735
• Other reference link(s): executor: Show placement information in SHOW TABLE x REGIONS tidb#35202

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• Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

LGTM

[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c0d554b

[TomShawn]

/verify

[TomShawn]

/merge