This script is really a one time script for searching for files that use
`FactoryBot.build` or `FactoryBot.create`, and replace them with the
straight `ActiveRecord` equivalents.

Refactoring of this script into a runnable class, but also so it can be
used in larger scripts.

Replaces external grep calls with custom some File/IO code.

Written in a way where each file being searched is only requires 1 open
operation, and only has to load in as much content as is necessary to do
the replace (thanks to `.rewind` and `truncate`).

Determines all original factories that need to be replaced, and replaces
them across all repos, creating a commit for each factory change.

Allows finding and replacing of FactoryBot calls that are defined
acrossed multiple lines.