This PR is step 5 of this tech spec - https://docs.google.com/document/d/1qFk4YqnwxE4MCGeJ9M2scGOYej6JnDy9A0zbICP_zjI/edit.
The first of (at least) 2 PRs to implement this on the source side. I made some headway before deciding to break the changes into one PR implementing this for discover schema job, and another PR implementing this for read. The combined PR would have been too big otherwise.
Also refactor MoreResources as the test method was attempting to write to the location classes where loaded out from - the issue is we cannot guarantee where the class is loaded from can be written to. Changing this to write to a random folder in the temp directory.
58062faccb