allocator concept requirements

[jxy-s]

Implements rad::AllocatorRequires and static asserts in usage paths. This requirement institutes that Radiant allocators:

• Destruction does not throw.
• Copying does not throw.
• Moving does not throw.
• Freeing memory does not throw.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.13%. Comparing base (11f033f) to head (864d4cf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #26   +/-   ##
=======================================
  Coverage   90.13%   90.13%           
=======================================
  Files          18       18           
  Lines        1977     1977           
  Branches      257      257           
=======================================
  Hits         1782     1782           
  Misses         13       13           
  Partials      182      182           

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