feat: Add new Remap interface to relations

[EpsilonPrime]

Remap() is an alternative to the current Remap variants currently found on the Builder interface. It preserves the existing behavior including checking the proposed mapping for validity. It also modifies the relation instead of returning a copy. All of the existing Remap function variants have been marked as deprecated in favor of Remap.

[codecov]

Codecov Report

Attention: Patch coverage is 91.78082% with 6 lines in your changes missing coverage. Please review.

Project coverage is 61.69%. Comparing base (9b453f5) to head (0178a4f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
plan/relations.go	90.32%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   59.56%   61.69%   +2.12%     
==========================================
  Files          43       44       +1     
  Lines        9316     9781     +465     
==========================================
+ Hits         5549     6034     +485     
+ Misses       3507     3469      -38     
- Partials      260      278      +18     

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