feat: add isUUID 'loose' option to validate UUID-like hexadecimal str…

[bc-m]

Closes #2546

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bdb8f9e) to head (3054da3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2553   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2535      2535           
  Branches       641       641           
=========================================
  Hits          2535      2535           

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