use wp-stubs

[tfrommen]

PR into feature/phpstan branch, replacing the phpstan-wordpress extension with wp-stubs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.54%. Comparing base (5ceef1a) to head (36d2799).

Additional details and impacted files

@@                Coverage Diff                 @@
##             feature/phpstan      #61   +/-   ##
==================================================
  Coverage              98.54%   98.54%           
  Complexity               251      251           
==================================================
  Files                     10       10           
  Lines                    620      620           
==================================================
  Hits                     611      611           
  Misses                     9        9           

Flag	Coverage Δ
unittests	98.54% <ø> (ø)

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