KVStore: LargeTxn spill: Store kv pairs of large txns in dedicated CFs

[CalvinNeo]

What problem does this PR solve?

Issue Number: ref #8736

Problem Summary:

We will store kv pairs of large txns seperately in a dedicated cf, which is called LargeTxnDefaultCf.
The struct is a double level map start_ts -> pk -> (TiKVKey, TiKVValue). The inner map is RegionCFDataBase<LargeDefaultCFDataTrait>, in which LargeDefaultCFDataTrait is something very similar to RegionDefaultCFDataTrait.

We have to introduce a RegionPersistExtension::LargeTxnDefaultCfMeta in order to parse LargeDefaultCFDataTrait in RegionData, if it actually exists.

We won't actually write anything into persisted region data, until the feature GAs.

Meanwhile, we have also

1. dbgKVStore that can mitigate the "friend" problem.
2. A two level iterator for LargeTxnDefaultCf.
3. A RegionSerdeOpts to enhance original Region::CURRENT_VERSION.

What is changed and how it works?

Check List

Tests

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

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

None

[CalvinNeo]

/run-all-tests

[Lloyd-Pottiger]

Seems not used. And what if ts is not exist?

[CalvinNeo]

I'd like it throws a standard error? Do you think better we wrapped it into a DB::Exception?

[Lloyd-Pottiger]

Throws a standard error is ok. I am just curious where is be used.

[CalvinNeo]

changed into DB::Exception, since std exception is not as respected as DB exception.

[Lloyd-Pottiger]

lgtm

[CalvinNeo]

/hold

[CalvinNeo]

/hold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JinheLin, Lloyd-Pottiger

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-23 08:57:42.272512281 +0000 UTC m=+606751.020135391: ☑️ agreed by Lloyd-Pottiger.
• 2024-03-14 06:40:32.496943801 +0000 UTC m=+926859.519190189: ☑️ agreed by JinheLin.

[ti-chi-bot]

PR needs rebase.

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[ti-chi-bot]

@CalvinNeo: 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-integration-test	841c613	link	true	/test pull-integration-test
pull-unit-test	841c613	link	true	/test pull-unit-test

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