[MAINTENANCE] Fix PSR-12 code style

[marco-lengua]

This PR fixes all formatting issues the extension PHP CS FIXER found for PSR-12 compliant code style.
These are many files but mainly only minor issues like whitespaces are fixed. This PR is meant to improve PSR-12 compliant code formatting for this project. Everyone can now use the PHP CS FIXER to make the code PSR-12 compliant prior to make a pull request so there won't be formatting changes reqeusted by e.g. Codacy.
Hope this helps a bit!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (4c45868) to head (531ee3b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #1874   +/-   ##
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[sebastian-meyer]

Thank you very much!

I just fixed a few typos and renamed php-cs-fixer.config.php to .php-cs-fixer.dist.php (according to documentation).

I can't make changes to files you didn't change, so I'll create a pull request to add the script changes to composer.json.

[sebastian-meyer]

I can't make changes to files you didn't change, so I'll create a pull request to add the script changes to composer.json.

marco-lengua#1