Refactor Codebase to use modern PHP features using Rector

[stefanzweifel]

Maintenance PR that uses Rector to update the entire code base to use modern PHP features.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (d9ab177) 95.54% compared to head (699fd14) 95.09%.
Report is 1 commits behind head on main.

❗ Current head 699fd14 differs from pull request most recent head 5833b29. Consider uploading reports for the commit 5833b29 to get more accurate results

Files	Patch %	Lines
src/Console/StatsListCommand.php	86.66%	2 Missing ⚠️
src/ClassesFinder.php	80.00%	1 Missing ⚠️
src/Classifiers/MiddlewareClassifier.php	50.00%	1 Missing ⚠️
src/Statistics/NumberOfRoutes.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #225      +/-   ##
============================================
- Coverage     95.54%   95.09%   -0.45%     
  Complexity      267      267              
============================================
  Files            44       44              
  Lines           785      714      -71     
============================================
- Hits            750      679      -71     
  Misses           35       35              

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