Make Durabler interface methods public

[timvaillancourt]

Description

This PR implements an open RFC for moving the Durabler interface from the reparentutil package to public methods so it is easier to integrate Durability Policies from external packages

Related Issue(s)

RFC: #15544

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 65.78%. Comparing base (2078d62) to head (941846f).
Report is 1 commits behind head on main.

Files	Patch %	Lines
go/vt/vtctl/reparentutil/durability.go	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15548      +/-   ##
==========================================
- Coverage   65.78%   65.78%   -0.01%     
==========================================
  Files        1561     1561              
  Lines      194838   194838              
==========================================
- Hits       128183   128174       -9     
- Misses      66655    66664       +9     

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[deepthi]

LGTM. We also need approval from @GuptaManan100 as the primary author/maintainer of these files.

[deepthi]

@GuptaManan100 should we add this to the release notes for v20?

[GuptaManan100]

Yes! The changes look good to me, but we do need to add a section describing this change to the interface in changelog/20.0/20.0.0/summary.md

[timvaillancourt]

Yes! The changes look good to me, but we do need to add a section describing this change to the interface in changelog/20.0/20.0.0/summary.md

@GuptaManan100 / @deepthi sounds good, changelog added 👍. Edits are appreciated