Allow omitting some ParamSource subclassed from
ParamSource.get_all_implementations().
My previous attempts at automagically detecting abstract classes failed
conceptually, and the easiest, most explicit way is already used in
ConfigurableParameter: add an is_abstract flag.
Prep for Ie7171c152a7b478736f8825050305606b5af5735
Change-Id: Icfccdd0a8ecb5e0e9d22afa490d73c9f1849a64c
Implement pySim.esim.saip.personalization.BatchPersonalization,
generating N eSIM profiles from a preset configuration.
Batch parameters can be fed by a constant, incrementing, random or from
CSV rows: add pySim.esim.saip.param_source.* classes to feed such input
to each of the BatchPersonalization's ConfigurableParameter instances.
Related: SYS#6768
Change-Id: I497c60c101ea0eea980e8b1a4b1f36c0eda39002
