VideoCutTool: Improve the functionality of VideoCutTool

Proposed features to improve VideoCutTool's user experience on the Wikimedia website: 1) Cloud storage to save work, and resume editing from anywhere 2) Advanced editing features like special effects, transitions, and text overlays using FFPMEG commands 3) Keyboard shortcuts to speed up the editing process 4) Undo and redo functionality to revert changes and reduce risk of data loss 5) Unit testing with Jest, React testing library, and API mocking for error, internationalization, and cross-browser testing 6) Persisting edited video through local storage or server-side database.