Support commerce setting to create users during checkout

Splitting this out from 🐛 Switch from hook_user_insert to submit handler so the code fires earlier Closed: outdated .

Right now the module doesn't explicitly handle other modules that create users in a flow separate from the normal user flow, such as commerce.

It would be nice to figure out some way to handle those better. One idea is just to change the module to work on the submit handler of the normal user register form. That way it *wouldn't* fire during something like commerce's checkout. But is that really desirable for it to not interact with the commerce user creation process? My sense is that this module should still try to hide username fields and still try to generate usernames even if the user is being created by commerce.