feat: Asynchronous resolution processing

Refactor the image and video resolution creation process to be
asynchronous. This change optimizes performance by sending
`original_image.id` and `original_video.id` to
`create_image_resolutions.delay` and `create_video_resolutions.delay`
respectively, rather than processing synchronously. This enhancement
significantly improves the scalability of handling large sets of images
and videos, ensuring system resources are utilized more efficiently and
users experience less delay.

quackscape/tours/management/commands/createresolutions.py

@@ -8,7 +8,7 @@ class Command(BaseCommand):
 
     def handle(self, *args, **options):
         for original_image in OriginalImage.objects.all():
-            create_image_resolutions(original_image)
+            create_image_resolutions.delay(original_image.id)
 
         for original_video in OriginalVideo.objects.all():
-            create_video_resolutions(original_video)
+            create_video_resolutions.delay(original_video.id)