Support scan-keys command to scan the key space starting a specific revision

[ahrtr]

The etcd-dump-db scan-keys ... is useful to analyze issue something like etcd-io/bbolt#778. It supports scanning the key space even the db is corrupted.

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

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.83%. Comparing base (4a11ca6) to head (def064f).

❗ Current head def064f differs from pull request most recent head cb2f7b7

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Additional details and impacted files

see 25 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18539      +/-   ##
==========================================
+ Coverage   68.73%   68.83%   +0.10%     
==========================================
  Files         420      420              
  Lines       35470    35470              
==========================================
+ Hits        24381    24417      +36     
+ Misses       9668     9633      -35     
+ Partials     1421     1420       -1     

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[ahrtr]

As a followup, we also need to add a command find-parent to find the parents in the B-tree of a specific page.

[jmhbnz]

LGTM - Thanks @ahrtr

[ivanvc]

LGTM. Thanks, Benjamin.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, jmhbnz

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