config: add option to skip rawkv region bound

[rleungx]

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)
• No code

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

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[rleungx]

/retest

[codecov]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.46%. Comparing base (8139aa6) to head (167c61a).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10115      +/-   ##
==========================================
+ Coverage   78.40%   78.46%   +0.06%     
==========================================
  Files         518      518              
  Lines       69438    69412      -26     
==========================================
+ Hits        54441    54465      +24     
+ Misses      11045    11012      -33     
+ Partials     3952     3935      -17     

Flag	Coverage Δ
unittests	78.46% <95.23%> (+0.06%)	⬆️

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[bufferflies]

pls add some comment about this configuration only work in keyspace,

[bufferflies]

I think it should be true, most case user don't use raw kv in keyspace clustger

[bufferflies]

If the user cluster only uses the raw api, how to avoid splitting the txn key?

[lhy1024]

But waitKeyspaceRegionSplit will call CheckKeyspaceRegionBound, and it always checks raw bound and txn bound

func (manager *Manager) CheckKeyspaceRegionBound(id uint32) bool {
	regionBound := MakeRegionBound(id)
	return manager.checkBound(regionBound.RawLeftBound) &&
		manager.checkBound(regionBound.RawRightBound) &&
		manager.checkBound(regionBound.TxnLeftBound) &&
		manager.checkBound(regionBound.TxnRightBound)
}