Parallelize bundle audit for NetworkPolicy objects

Also switch from using docker save -> extract approach to
opm render -> declCfg.Load() approch, which is much faster and
memory efficient.

Performance improvements while aduiting catalogs:

1. redhat-operators v4.13 took ~1 hour 20 mins
2. redhat-operators v4.14 took ~1 hour 30 mins

Down from ~4 hours.

Author: anik120