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/serializers/schedule.py

@@ -0,0 +1,35 @@
+from rest_framework import serializers
+
+from ..models import Schedule
+
+
+class ScheduleSerializer(serializers.HyperlinkedModelSerializer):
+    file_id = serializers.IntegerField(source="file.id", read_only=True)
+    stream_id = serializers.IntegerField(source="stream.id", read_only=True)
+    instance_id = serializers.IntegerField(source="instance.id", read_only=True)
+    cue_out = serializers.DurationField(source="get_cueout", read_only=True)
+    ends = serializers.DateTimeField(source="get_ends", read_only=True)
+
+    class Meta:
+        model = Schedule
+        fields = [
+            "item_url",
+            "id",
+            "starts",
+            "ends",
+            "file",
+            "file_id",
+            "stream",
+            "stream_id",
+            "clip_length",
+            "fade_in",
+            "fade_out",
+            "cue_in",
+            "cue_out",
+            "media_item_played",
+            "instance",
+            "instance_id",
+            "playout_status",
+            "broadcasted",
+            "position",
+        ]