chore(phpstan): enable phpstan in bundled extensions (#3667)

* feat(phpstan): pick up extended model relations typings
* feat(phpstan): pick up extended model date attributes
* feat(core): introduce `castAttribute` extender
Stops using `dates` as it's deprecated in laravel 8
* feat(phpstan): pick up extended model attributes through casts
* fix: extenders not resolved when declared namespace
* fix(phpstan): new model attributes are always nullable
* chore(phpstan): add helpful cache clearing command
* Apply fixes from StyleCI
* chore: improve extend files provider logic
* chore: rename `castAttribute` to just `cast`
* chore: update phpstan package to detect `cast` method
* chore: enable phpstan in bundled extensions
* chore: rebasing conflicts
* chore: rebasing conflicts
* chore: typings for latest 1.7 changes

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

extensions/nicknames/extend.php

@@ -26,6 +26,9 @@ return [
 
     new Extend\Locales(__DIR__.'/locale'),
 
+    (new Extend\Model(User::class))
+        ->cast('nickname', 'string'),
+
     (new Extend\User())
         ->displayNameDriver('nickname', NicknameDriver::class),
 

extensions/nicknames/src/NicknameFullTextGambit.php

@@ -58,5 +58,7 @@ class NicknameFullTextGambit implements GambitInterface
                 'id',
                 $this->getUserSearchSubQuery($searchValue)
             );
+
+        return true;
     }
 }