feat(api): split api into multiple apps (#1626)

Fixes #1622

- split the api into 4 apps: core, history, schedule, storage
- exploded the settings into testing/prod

api/libretime_api/schedule/views/__init__.py

@@ -0,0 +1,21 @@
+from .playlist import PlaylistContentViewSet, PlaylistViewSet
+from .podcast import (
+    ImportedPodcastViewSet,
+    PodcastEpisodeViewSet,
+    PodcastViewSet,
+    StationPodcastViewSet,
+)
+from .schedule import ScheduleViewSet
+from .show import (
+    ShowDaysViewSet,
+    ShowHostViewSet,
+    ShowInstanceViewSet,
+    ShowRebroadcastViewSet,
+    ShowViewSet,
+)
+from .smart_block import (
+    SmartBlockContentViewSet,
+    SmartBlockCriteriaViewSet,
+    SmartBlockViewSet,
+)
+from .webstream import WebstreamMetadataViewSet, WebstreamViewSet