Convert to native enums in PHP 8.1

[Firehed]

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[codecov]

Codecov Report

Merging #124 (3ee56b5) into 8.1 (56a31db) will decrease coverage by 0.67%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                8.1     #124      +/-   ##
============================================
- Coverage     96.28%   95.60%   -0.68%     
  Complexity      119      119              
============================================
  Files            21       23       +2     
  Lines           457      455       -2     
============================================
- Hits            440      435       -5     
- Misses           17       20       +3     

Impacted Files	Coverage Δ
src/Enums/HTTPMethod.php	0.00% <0.00%> (ø)
src/Enums/HTTPMethodGTE81.php	0.00% <0.00%> (ø)
src/Enums/HTTPMethodLTE80.php	0.00% <0.00%> (ø)
src/Console/GenerateEndpoint.php	91.02% <0.00%> (-0.23%)	⬇️
src/Config.php	97.29% <0.00%> (-0.08%)	⬇️
src/Console/GenerateFrontController.php	100.00% <0.00%> (ø)
src/Traits/EndpointTestCases.php	94.59% <0.00%> (+2.48%)	⬆️

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