Add --keys-only option for mvcc range

[nwnt]

Part of #20386

We need the option so that the mvcc can perform --keys-only operation on the backend side.

[k8s-ci-robot]

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[nwnt]

cc @serathius

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.40%. Comparing base (9186f6a) to head (efad77f).
⚠️ Report is 36 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/mvcc/kv.go	40.00% <ø> (ø)

... and 39 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #21612   +/-   ##
=======================================
  Coverage   68.40%   68.40%           
=======================================
  Files         428      429    +1     
  Lines       35397    35391    -6     
=======================================
- Hits        24212    24210    -2     
+ Misses       9777     9774    -3     
+ Partials     1408     1407    -1     

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[serathius]

Any implementation plan?

[nwnt]

Let me write that up and share with you in a google doc.

[serathius]

Maybe let's talk first, the change is not as complicated to require a doc.

[k8s-ci-robot]

PR needs rebase.

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