[realname]JH real name system

Please review the MR, thanks @icbd @JeremyWuuuuu

See epic https://gitlab.com/groups/gitlab-jh/-/epics/5274

To deploy the feature on localhost:

1 prepare the tencent sms key and run with env TC_ID=xxx TC_KEY=xxx bundle exec rails s

2 http://localhost:3000/admin/application_settings/reporting#js-spam-settings config recaptcha keys

3 http://localhost:3000/admin/application_settings/general config Terms of Service and Privacy Policy

Related issue: #157 #182 #183 #190 #191