Overview

• I noticed that we have no denormalized output table corresponding to the core_eia923__monthly_energy_storage core table -- it's the only one of the core EIA-923 tables that's missing an output table.
• To make this data easier to work with, we should add an out_eia923__monthly_energy_storage table that includes additional information about the individual energy storage plants, including their names. Probably using the pudl.output.eia923.denorm_by_gen() function? Or are the energy storage "generators" different enough that that doesn't work?