storage: Add API for RawKV GC

[pingyu]

Signed-off-by: pingyu yuping@pingcap.com

What problem does this PR solve?

Add APIs for RawKV GC (storage part of #4866).
Issue Number: ref #4865
RFC: tikv/rfcs#90

What is changed and how does it work?

Add APIs for RawKV GC.

Check List

Tests

• Unit test

Code changes

• Has configuration change
  No.

• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
  No.

• Has persistent data change
  No.

Side effects
No.

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
  No.
• PR to update pingcap/tiup:
  No.
• Need to cherry-pick to the release branch
  No.

Release note

Add APIs for RawKV GC.

[ti-chi-bot]

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[pingyu]

/cc @nolouch @AndreMouche

[pingyu]

/cc @nolouch @AndreMouche

PTAL, thanks~

[codecov]

Codecov Report

Merging #4918 (0b2ec53) into master (c1ae899) will decrease coverage by 0.08%.
The diff coverage is 67.74%.

@@            Coverage Diff             @@
##           master    #4918      +/-   ##
==========================================
- Coverage   75.36%   75.28%   -0.09%     
==========================================
  Files         296      298       +2     
  Lines       29441    29514      +73     
==========================================
+ Hits        22189    22219      +30     
- Misses       5322     5348      +26     
- Partials     1930     1947      +17     

Flag	Coverage Δ
unittests	75.28% <67.74%> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
server/storage/endpoint/gc_safe_point.go	70.83% <ø> (ø)
server/storage/endpoint/gc_service_group.go	65.51% <65.51%> (ø)
server/storage/endpoint/key_path.go	100.00% <100.00%> (ø)
server/tso/local_allocator.go	64.86% <0.00%> (-13.52%)	⬇️
server/tso/allocator_manager.go	63.39% <0.00%> (-5.16%)	⬇️
pkg/dashboard/adapter/manager.go	79.31% <0.00%> (-4.39%)	⬇️
pkg/etcdutil/etcdutil.go	85.05% <0.00%> (-3.45%)	⬇️
server/schedule/checker/merge_checker.go	69.92% <0.00%> (-2.88%)	⬇️
server/api/config.go	60.64% <0.00%> (-2.72%)	⬇️
server/schedule/labeler/rules.go	87.20% <0.00%> (-2.33%)	⬇️
... and 20 more

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[ti-chi-bot]

@pingyu: PR needs rebase.

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