Refactor computing changed keys for Plugin Framework

[t0yv0]

The slight simplification of the code relaxes some dependencies on the convert module which in turn unlocks simplifying that module.

[codecov]

Codecov Report

Attention: Patch coverage is 56.52174% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 59.52%. Comparing base (c5f6262) to head (e8d54f8).

Files	Patch %	Lines
pf/tfbridge/provider_diff.go	56.52%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1778      +/-   ##
==========================================
- Coverage   59.98%   59.52%   -0.46%     
==========================================
  Files         302      309       +7     
  Lines       42180    42539     +359     
==========================================
+ Hits        25300    25321      +21     
- Misses      15452    15791     +339     
+ Partials     1428     1427       -1     

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