Improve the phpstan setup

[stof]

• add more precise types for some array parameters
• ignore missing iterable value errors only for the selector and locator arguments related to our SelectorInterface rather than disabling the check globally

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (4897dc4) to head (05ffb4e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #878   +/-   ##
=========================================
  Coverage     98.56%   98.56%           
- Complexity      349      389   +40     
=========================================
  Files            24       24           
  Lines           909      909           
=========================================
  Hits            896      896           
  Misses           13       13           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.