feat: rewrite core

[Ravencentric]

BREAKING CHANGES:

• ArchiveFile.get_members() now returns a generator instead of a tuple
• consistently return KeyError whenever a given member is not in the archive
• raise NotImplementedError instead of custom UnsupportedArchiveOperationError

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (af23af2) to head (4a36c8c).

Additional details and impacted files

@@            Coverage Diff             @@
##              main        #4    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            7        11     +4     
  Lines          361       690   +329     
==========================================
+ Hits           361       690   +329     

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