Adding phone numbers to user accounts

[plunkettgoogle]

Hello fine folks,

I'm currently working on a feature over in the CityOfDetroit/bloom fork that would allow for sending listing updates via SMS. Naturally this requires associating a phone number to a user account. I've heard that y'all are working on 2-factor auth with a phone number, so I wanted to make sure that wherever I land is amenable to how y'all plan on adding phone numbers. I've uploaded a PR on the CityOfDetroit repo: CityOfDetroit#710.

If anyone could take a look and make sure I'm not too far off the mark, that would be great. The PR obviously needs more work (tests, formatting validation, etc), but I wanted to get some of your eyes on it sooner rather than later.

Thanks!

[plunkettgoogle]

I slimmed down the PR to only include the necessary changes in the user_accounts table + backend APIs, and upstreamed to a PR here: #2075. Hopefully this is compatible with what y'all were planning with 2-factor authentication.

[plunkettgoogle]

Unfortunately it looks like CityOfDetroit is missing some user profile related changes (#1862), so I'll need to make another PR once we've merged those changes downstream. You can still check out the original PR though, I think the backend changes should be largely the same.