ddl: support region split policy

[xhebox]

What problem does this PR solve?

Issue Number: close #65132

Problem Summary: Basically some new sugar syntax. And extracted/refactored splitting keys part into a util package.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Support `ALTER TABLE SPLIT  {PRIMARY KEY [<pk_name>] | INDEX <index_name>} BETWEEN` and also for `CREATE TABLE`

[tiprow]

Hi @xhebox. Thanks for your PR.

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[xhebox]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.1077%. Comparing base (865730d) to head (2545fca).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65133        +/-   ##
================================================
- Coverage   70.7532%   70.1077%   -0.6455%     
================================================
  Files          1895       1894         -1     
  Lines        517985     517786       -199     
================================================
- Hits         366491     363008      -3483     
- Misses       126990     130173      +3183     
- Partials      24504      24605       +101     

Flag	Coverage Δ
integration	47.0066% <ø> (-1.1647%)	⬇️

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Components	Coverage Δ
dumpling	52.7568% <ø> (ø)
parser	∅ <ø> (∅)
br	57.8103% <ø> (-0.4094%)	⬇️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tiprow]

@xhebox: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	2545fca	link	true	/test fast_test_tiprow

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[ti-chi-bot]

@xhebox: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-unit-test-ddlv1	2545fca	link	true	/test pull-unit-test-ddlv1
pull-unit-test-next-gen	2545fca	link	true	/test pull-unit-test-next-gen
idc-jenkins-ci-tidb/unit-test	2545fca	link	true	/test unit-test
idc-jenkins-ci-tidb/mysql-test	2545fca	link	true	/test mysql-test
pull-br-integration-test	2545fca	link	true	/test pull-br-integration-test

Full PR test history. Your PR dashboard.

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