Implement a custom Flask JSON provider called SortableJSONProvider by subclassing…

Implement a custom Flask JSON provider called SortableJSONProvider by subclassing…: a task in repo2rlenv-code-instruct (Harbor dataset). Additionally, implement a helper function build json app(sort keys=True) that creates a Flask app with SortableJSONProvider configured (using the given sort keys…

The task

Additionally, implement a helper function `build_json_app(sort_keys=True)` that creates a Flask app with `SortableJSONProvider` configured (using the given `sort_keys` setting) and returns it.

Part of FineEnvs/repo2rlenv-code-instruct.