Add phone to user_details and create verification_codes

As the title, we jh need to add the field of phone to the table of user_details and create table of verification_codes to save and verify user's phone by sending a short message and save it to user_detail

See related JH issue

• https://gitlab.com/gitlab-jh/gitlab/-/issues/157
• https://gitlab.com/gitlab-jh/gitlab/-/issues/182
• https://gitlab.com/gitlab-jh/gitlab/-/issues/183

See related JH Merge request, this MR is split from

• gitlab-jh/gitlab!113 (closed)

Could you please review it or ask someone to review, thanks. @godfat-gitlab @abrandl