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/core/models/service.py

@@ -0,0 +1,10 @@
+from django.db import models
+
+
+class ServiceRegister(models.Model):
+    name = models.CharField(primary_key=True, max_length=32)
+    ip = models.CharField(max_length=45)
+
+    class Meta:
+        managed = False
+        db_table = "cc_service_register"