PHP 8.2 updates

[yann-eugone]

Since we are now targeting PHP >= 8.2.0, we can use more native features, such as

• readonly properties and classes
• promoted properties

There is also many minor enhancements we can do to simplify things
I've used some Rector to update the source code, but the configuration was not designed to stay much longer than the update

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.59%. Comparing base (8d002d2) to head (ea4b3ee).

Additional details and impacted files

@@             Coverage Diff              @@
##                0.x     #183      +/-   ##
============================================
- Coverage     99.59%   99.59%   -0.01%     
+ Complexity      963      958       -5     
============================================
  Files           166      166              
  Lines          2977     2957      -20     
============================================
- Hits           2965     2945      -20     
  Misses           12       12              

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