Genome::Process

`Genome::Process` serves as a holder of metadata related to commands that run workflows.  It is in some ways a stripped down `Genome::Model::Build`.  It will make possible `genome model build view` like views for things such as `Genome::VariantReporting` or the data importing commands.
I was following patterns I saw elsewhere in our sqitch scripts, it seemed to be <schema>_<table>_<column(s)>_idx.  But since the schema acts like a namespace, it seems like the repetition could be eliminated without ambiguity.