refactor: Migrate to API v2

- Added auto schema migration
- Refactored /api/subs, /api/collections, /api/artifacts. Now these APIs will return array instead of object. This enables sorting items in the future.

backend/src/utils/database.js

@@ -0,0 +1,17 @@
+export function findByName(list, name) {
+    return list.find((item) => item.name === name);
+}
+
+export function findIndexByName(list, name) {
+    return list.find((item) => item.name === name);
+}
+
+export function deleteByName(list, name) {
+    const idx = findIndexByName(list, name);
+    list.splice(idx, 1);
+}
+
+export function updateByName(list, name, newItem) {
+    const idx = findIndexByName(list, name);
+    list[idx] = newItem;
+}