Specify Output .simularium File Name

[ascibisz]

Use Case

Currently, the generated .simularium file is named based on a variety of parameters in the recipe and config files that are submitted for a cellpack packing. This means if we wanted to know what the output file name is going to be at the time of submitting a packing request, we would have to read the recipe and config files in advance, which is inconvenient if we're submitting a AWS packing with a recipe path that's in firebase.

It would be good to have an override for the existing functionality so we can provide a output file name to the pack script that will be used when the .simularium file is written.