Enhancement: Implement StringProvider::uuid()

[localheinz]

This pull request

• implements StringProvider::uuid()

[codecov]

Codecov Report

Merging #40 (ae08391) into main (e1cff20) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main      #40      +/-   ##
============================================
+ Coverage     96.77%   96.89%   +0.11%     
- Complexity       45       46       +1     
============================================
  Files             9        9              
  Lines           186      193       +7     
============================================
+ Hits            180      187       +7     
  Misses            6        6              

Impacted Files	Coverage Δ
src/StringProvider.php	100.00% <100.00%> (ø)

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