client: Add APIs for RawKV GC

[AmoebaProtozoa]

Signed-off-by: AmoebaProtozoa 8039876+AmoebaProtozoa@users.noreply.github.com

What problem does this PR solve?

Add APIs for RawKV GC (client 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

• Manual tests with server

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

Release note

Add APIs for RawKV GC.

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