lightning: extract region job's accessing data to an interface

[lance6716]

What problem does this PR solve?

Issue Number: ref #45719

Problem Summary:

What is changed and how it works?

part of #45356

before this PR, region job holds an Engine structure which is the concept of local backend. In this PR an interface ingestData replaces Engine so we can introduce a new implementation. Compared with Engine which stores data in the disk, we can use a pure memory sorted slice of KV pairs to accomplish region job.

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

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

None

[tiprow]

Hi @lance6716. Thanks for your PR.

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[codecov]

Codecov Report

Merging #45717 (c503062) into master (2e8de8d) will increase coverage by 0.2585%.
Report is 14 commits behind head on master.
The diff coverage is 93.7500%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #45717        +/-   ##
================================================
+ Coverage   73.2032%   73.4617%   +0.2585%     
================================================
  Files          1265       1278        +13     
  Lines        390125     398632      +8507     
================================================
+ Hits         285584     292842      +7258     
- Misses        86231      87246      +1015     
- Partials      18310      18544       +234     

Flag	Coverage Δ
integration	78.1388% <ø> (?)
unit	73.4537% <93.7500%> (+0.2505%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	85.0467% <ø> (+0.0108%)	⬆️
br	52.4576% <93.7500%> (+0.4564%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, wjhuang2016

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-01 10:03:59.6472305 +0000 UTC m=+179723.589579027: ☑️ agreed by wjhuang2016.
• 2023-08-02 03:17:19.706581162 +0000 UTC m=+241723.648929678: ☑️ agreed by tangenta.

[lance6716]

/retest

[tiprow]

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/retest

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