tool: add a tool to patrol region key

[lhy1024]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 6 lines in your changes missing coverage. Please review.

Project coverage is 76.12%. Comparing base (ab7efa6) to head (4624ec6).
Report is 44 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9320      +/-   ##
==========================================
- Coverage   76.14%   76.12%   -0.02%     
==========================================
  Files         472      478       +6     
  Lines       73259    74764    +1505     
==========================================
+ Hits        55783    56916    +1133     
- Misses      14026    14312     +286     
- Partials     3450     3536      +86     

Flag	Coverage Δ
unittests	76.12% <77.77%> (-0.02%)	⬇️

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[lhy1024]

./pd-ctl -u 192.168.8.88:2379 operator add split-region \
$(./pd-ctl -u 192.168.8.88:2379 region key "7480000000000AE1FFAB5F72F800000000FF052EEA0100000000FB" | jq '.id') \
--policy=usekey --keys=7480000000000B01FFE75F72F800000000FF05613A0100000000FB

[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456, multiple issues should use full syntax for each issue and be separated by a comma, like: Issue Number: close #123, ref #456.

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