Separate storage delta layer to multiple layers

[lidezhu]

What problem does this PR solve?

Issue Number: close #4089

Problem Summary: second part of #3865.

What is changed and how it works?

Detailed change: https://docs.google.com/document/d/1nlUaeNHdGIIeAVP_XBOWdEcS0P6h9azoYATFQ98XONs/edit

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]

This pull request has been approved by:

• flowbehappy

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[flowbehappy]

LGTM

[lidezhu]

/merge

[ti-chi-bot]

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/run-all-tests

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[ti-chi-bot]

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

Commit hash: 2850b36

[sre-bot]

Coverage for changed files

too many lines from llvm-cov, please refer to full report instead

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
16674      9491             43.08%    184376  95839        48.02%

full coverage report (for internal network access only)

[sre-bot]

Coverage for changed files

too many lines from llvm-cov, please refer to full report instead

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
16674      9491             43.08%    184376  95859        48.01%

full coverage report (for internal network access only)