Alternate combinations of factors for password reset / username reminder

[stuartpb]

This is one of the classes of note being pulled out of profiles with #1 (comment) (see also opws/opws-dataset#309):

• hrblock.com: password.reset.flow.request.form.notes ("Also accepts a combination of first name, last name, Social Security number, and date of birth.")
• hrblock.com: username.reminder.request.form.notes ("Also accepts a combination of first name, last name, Social Security number, and date of birth.")
• netflix.com: password.reset.flow.request.form.notes ("Also accepts a combination of first name, last name, and credit card number.")

[stuartpb]

Previously discussed in opws/opws-dataset#149: before the form design for this stuff, there was a single accepts field that listed accepted combinations of factors.

Maybe a 2D proofs (or factors or something) array, where each list within the list describes a valid combination of inputs that's acceptable? Or bring back accepts, like the account.accepts structure, but have it be submit.accepts (or also.accepts), and two-dimensional?

One of the issues with this is that, frequently, the alternative list is just a completely separate list of factors that may not have tokens in the schema. (This is especially the case for many of the further.requirements notes listed in #1 (comment).)