Ability to reuse S3Storages and RemoteDiskStorages with CrossProjectResolvers

In the same way that resources can be created against a schema existing in another project; it should be possible to create files against a storage existing in another project.

This is becoming even more useful in cases you want to control the `capacity` from a centralized place.

Start by tracing CrossProjectResolvers and the S3Storages and RemoteDiskStorages entry points to understand how resources are created against schemas in another project. Done means files can be created against storage in another project while capacity remains controllable from a centralized location.

Written by the indexing model from the issue text.