get_patches now returns an extended DataFrame with a patch column, so that exporters have access to patch metadata with no risk of mixing up indexing

Product methods call RoiSet directly; this is causing problems with multichannel ones where raw data is essentially re-issues to RGB channels

Some test coverage, those that are failing are because of issues propagating nested parameters to pydantic models

Combined all export products into a single call, which routes individual products' export methods and parameters