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/role.py

@@ -0,0 +1,11 @@
+GUEST = "G"
+DJ = "H"
+PROGRAM_MANAGER = "P"
+ADMIN = "A"
+
+USER_TYPES = {
+    GUEST: "Guest",
+    DJ: "DJ",
+    PROGRAM_MANAGER: "Program Manager",
+    ADMIN: "Admin",
+}