Stream video with GridFSBucketAdapter (implements byte-range requests) (#6028)

* Stream video with GridFSBucketAdapter (implements byte-range requests)

Closes: https://github.com/parse-community/parse-server/issues/5834

Similar to https://github.com/parse-community/parse-server/pull/2437

I ran into this issue while trying to view a mov file in safari from the dashboard.

* Rename getFileStream to handleFileStream

src/Controllers/FilesController.js

@@ -92,8 +92,8 @@ export class FilesController extends AdaptableController {
     return FilesAdapter;
   }
 
-  getFileStream(config, filename) {
-    return this.adapter.getFileStream(filename);
+  handleFileStream(config, filename, req, res, contentType) {
+    return this.adapter.handleFileStream(filename, req, res, contentType);
   }
 }