S3 uploads support (#273)

* finish s3 uploads implementation

* remove unnecessary file

* fix docs

* update DEVELOPMENT.md

* update doc

* update default uploads path

src/backend/uploads/index.ts

@@ -0,0 +1,10 @@
+import appConfig from '../utils/appConfig.js';
+import S3UploadsDriver from './s3.js';
+import LocalUploadsDriver from './local.js';
+
+/**
+ * Initialize the uploads driver based on the configuration
+ */
+export const uploadsDriver = appConfig.uploads.driver === 'local'
+  ? new LocalUploadsDriver(appConfig.uploads)
+  : new S3UploadsDriver(appConfig.uploads);