[sunsch] Add satellites schedules directly from csv

Multiple users have seen a need to create and merge satellite profiles with the rest of the schedule, ideally straight from a tabular format like csv. Today they are handling it with their own scripts, through RMS or manually creating a schedule.

Could it be an option for sunsch to read csv's and create schedules for keywords like (from the top of my head):
`GSATPROD`
`GSATINJE`
`GCONSUMP`