ISSUE-345: add subscription date to response

Author: tatevikg1

src/OpenApi/SwaggerSchemasEntity.php

@@ -18,6 +18,12 @@
             format: 'date-time',
             example: '2022-12-01T10:00:00Z'
         ),
+        new OA\Property(
+            property: 'subscription_date',
+            type: 'string',
+            format: 'date-time',
+            example: '2022-12-01T10:00:00Z'
+        ),
         new OA\Property(property: 'public', type: 'boolean', example: true),
     ],
     type: 'object'

src/Serializer/SubscriberNormalizer.php

@@ -36,6 +36,7 @@ public function normalize($object, string $format = null, array $context = []):
                     'description' => $subscription->getSubscriberList()->getDescription(),
                     'creation_date' => $subscription->getSubscriberList()->getCreationDate()->format('Y-m-d\TH:i:sP'),
                     'public' => $subscription->getSubscriberList()->isPublic(),
+                    'subscription_date' => $subscription->getCreationDate()->format('Y-m-d\TH:i:sP'),
                 ];
             }, $object->getSubscriptions()->toArray()),
         ];

src/Serializer/SubscriptionNormalizer.php

@@ -32,6 +32,7 @@ public function normalize($object, string $format = null, array $context = []):
         return [
             'subscriber' => $this->subscriberNormalizer->normalize($object->getSubscriber()),
             'subscriber_list' => $this->subscriberListNormalizer->normalize($object->getSubscriberList()),
+            'subscription_date' => $object->getCreationDate()->format('Y-m-d\TH:i:sP'),
         ];
     }