Remove MergeTree family

[JaySon-Huang]

What problem does this PR solve?

Issue Number: close #3481, should merge #3563 first

Problem Summary: MergeTree family is deprecated in TiFlash. These codes are useless.

What is changed and how it works?

• Remove *MergeTree family
• Remove PersistedCache
• Remove PartLog https://clickhouse.com/docs/en/operations/system-tables/part_log/
• Remove MergeTreeSetIndex
• Remove PartPathSelector
• Remove system.{merge,parts,parts_columns}
• Remove TxnMergeTree data stream:
  • Remove TMTSortCursor
  • Remove MvccTMTSortedBlockInputStream/ReplacingTMTSortedBlockInputStream/TMTSingleSortedBlockInputStream/TMTSortedBlockInputStream/TMTUnionBlockInputStream

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

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• flowbehappy

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[JaySon-Huang]

/run-all-tests

[sre-bot]

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[JaySon-Huang]

/run-all-tests

[sre-bot]

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[JaySon-Huang]

/run-integration-test

[JaySon-Huang]

/run-integration-test

[JaySon-Huang]

/run-integration-test

[JaySon-Huang]

/run-unit-test

[sre-bot]

Coverage detail: https://ci-internal.pingcap.net/job/tics_ghpr_unit_test/217/cobertura/
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[SchrodingerZhu]

/run-all-tests

[sre-bot]

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[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/cc @flowbehappy @solotzg @fuzhe1989

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[SchrodingerZhu]

/merge

[ti-chi-bot]

@SchrodingerZhu: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: f65823a

[sre-bot]

Coverage detail: https://ci-internal.pingcap.net/job/tics_ghpr_unit_test/222/cobertura/
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