WIP - Support storage in RTS-GMLC input

[darrylmelander]

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[darrylmelander]

I had to make a few judgment calls on the storage CSV file format. Look at https://prescient--184.org.readthedocs.build/en/184/reference/file_formats/rts-gmlc/storage.html to see what I came up with. I'd appreciate feedback on some of the choices described below:

• The columns defined in the RTS-GMLC specification cover only a subset of the storage properties supported by Egret. To support Egret's additional properties, I added columns to the file format. I chose to require the columns defined by the RTS-GMLC format, while all the new columns are optional.
• The units for many columns defined by RTS-GMLC is GWh. Most other files use MW/MWh as typical units. I ended up sticking with GWh for the RTS-GMLC columns and using MW for the new columns. Opinions on whether we should use GW for the new columns instead?
• If a value is left out of the CSV, either because the column was optional and omitted, or because the value was left blank, we use default values. If the default value is listed in the documentation as Unlimited then the property is omitted from the Egret model. Otherwise the property is included in the Egret model with the listed default value.
• Are the units for Inflow Limit GWh really GWh, or is this a mistake and should have been GW?