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/subscriptions/extend.php

@@ -14,6 +14,7 @@ use Flarum\Discussion\Discussion;
 use Flarum\Discussion\Event\Saving;
 use Flarum\Discussion\Filter\DiscussionFilterer;
 use Flarum\Discussion\Search\DiscussionSearcher;
+use Flarum\Discussion\UserState;
 use Flarum\Extend;
 use Flarum\Post\Event\Deleted;
 use Flarum\Post\Event\Hidden;
@@ -24,6 +25,7 @@ use Flarum\Subscriptions\Listener;
 use Flarum\Subscriptions\Notification\FilterVisiblePostsBeforeSending;
 use Flarum\Subscriptions\Notification\NewPostBlueprint;
 use Flarum\Subscriptions\Query\SubscriptionFilterGambit;
+use Flarum\User\User;
 
 return [
     (new Extend\Frontend('forum'))
@@ -33,6 +35,12 @@ return [
 
     new Extend\Locales(__DIR__.'/locale'),
 
+    (new Extend\Model(User::class))
+        ->cast('last_read_post_number', 'integer'),
+
+    (new Extend\Model(UserState::class))
+        ->cast('subscription', 'string'),
+
     (new Extend\View)
         ->namespace('flarum-subscriptions', __DIR__.'/views'),