Bulk Deletes and Creates in MagmaCoreRemoteSparqlDatabase

[twalmsley]

Remote DbTransformations are inefficient and very slow because the MagmaCoreDatabase interface doesn't allow them to be handled in bulk.

Deletes should be few and far between since we're mainly interested in adding data, so they can be allowed to be slow until they become an issue.

Creates are a problem and need to be addressed sooner. We need a method on MagmaCoreDatabase similar to create(Thing t) such as create(DbTransformation t) that uses a local Model and loads it using connection.load(Model m)

[twalmsley]

I have a solution implemented locally and will create a PR when the prerequisite PRs are merged.