Implementation of a universal upload allowing for multiple storage backends
starting with `database` and `s3`.
Allows clients to put and retrieve files from either client or server using
a blend of client and server actions.
- Fixed z-index when dragging pre-existing fields
- Refactored document flow
- Added button spinner
- Added animation for document flow slider
- Updated drag and drop fields
- Updated document flow so it adjusts to the height of the PDF
- Updated claim plan dialog
