APIv4 - Use new class_args metadata to remove special handing for Cus…

…tomValue and CiviCase entities.

Before: When creating an API request, special logic was needed for CustomValue and CiviCase apis.
After: Metadata used.

Civi/Api4/Event/Subscriber/CreateApi4RequestSubscriber.php

@@ -37,20 +37,11 @@ public static function getSubscribedEvents() {
    * @param \Civi\Api4\Event\CreateApi4RequestEvent $event
    */
   public function onApiRequestCreate(\Civi\Api4\Event\CreateApi4RequestEvent $event) {
-    // Multi-record custom data entities
-    if (strpos($event->entityName, 'Custom_') === 0) {
-      $groupName = substr($event->entityName, 7);
-      if (CoreUtil::isCustomEntity($groupName)) {
-        $event->className = 'Civi\Api4\CustomValue';
-        $event->args = [$groupName];
-      }
-    }
-    else {
-      // Because "Case" is a reserved php keyword
-      $className = 'Civi\Api4\\' . ($event->entityName === 'Case' ? 'CiviCase' : $event->entityName);
-      if (class_exists($className)) {
-        $event->className = $className;
-      }
+    $provider = \Civi::service('action_object_provider');
+    $info = $provider->getEntities()[$event->entityName] ?? NULL;
+    if ($info) {
+      $event->className = $info['class'];
+      $event->args = $info['class_args'] ?? [];
     }
   }