Add custom auto-linker?

[jfoster17]

We definitely want to join some datasets on key, including joining the ATAC-seq peak matrix to the (created) table of peak positions and the gene expression matrix to the table of gene positions. We should do some or all of this automagically whether by adding a custom auto-linker, defining a custom glue startup script, or exposing the join_on_key functionality in the core Glue UI.