Previously we relied entirely on levenshtein_distance_spammer_emails site
setting to handle "similar looking" emails.
This commit improves the situation by always preferring to block (and check)
canonical emails.
This means that if:
`samevil+test@domain.com` is blocked the system will block `samevil@domain.com`
This means that `samevil+2@domain.com` (ad infinitum) will be blocked
Zeitwerk simplifies working with dependencies in dev and makes it easier reloading class chains.
We no longer need to use Rails "require_dependency" anywhere and instead can just use standard
Ruby patterns to require files.
This is a far reaching change and we expect some followups here.
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
