refactor!: remove `extract_harvester` from `transform` method

[korikuzma]

close #341

• create new method extract_harvested_data to separate these out
• transform now accepts harvested data as a parameter

Notes:

• I was considering moving extract harvester to the Harvester class or module. Decided not to for now and may address it in a separate issue

[korikuzma]

I'm going to change this to draft until #343 gets merged