Rename Handle to UniqueResource

[jxy-s]

Renames "Handle" to "UniqueResource".

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.94%. Comparing base (bae14c6) to head (87c1945).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   90.94%   90.94%           
=======================================
  Files          17       17           
  Lines        1922     1922           
  Branches      236      236           
=======================================
  Hits         1748     1748           
  Misses         13       13           
  Partials      161      161           

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