cache: implement binary search for ringBuffer range iterations

[apullo777]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

Open this PR to replace linear scan with binary search in ringBuffer pivot range operations
@serathius @MadhavJivrajani

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @apullo777. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[serathius]

Any performance improvement should be verified by accompanied benchmarks.

[serathius]

/ok-to-test

[serathius]

Do we have enough unit tests that cover all corner cases to fill safe optimizing here?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.22%. Comparing base (431a65a) to head (9ef7cef).
⚠️ Report is 378 commits behind head on main.

Additional details and impacted files

see 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20498      +/-   ##
==========================================
+ Coverage   69.21%   69.22%   +0.01%     
==========================================
  Files         419      419              
  Lines       34745    34745              
==========================================
+ Hits        24049    24053       +4     
+ Misses       9300     9295       -5     
- Partials     1396     1397       +1     

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[serathius]

/retest

[serathius]

Please rebase

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.