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.
This change actually makes the authoring flow work for
the most part by tying in emailing and more.
We have also done a number of quality of life updates to
simplify the codebase overall making it easier to continue
work on the refresh.
