User - Can add, verify, delete and assign secondary emails to SSO services

[atoff]

Requirements:

• A user, using the interface can add additional email addresses, which are marked as un-verified
• An email is sent to this new email address to confirm ownership, which will mark the email as verified
• A list of their primary and secondary emails can be found in the interface
• Secondary emails can be deleted from their list
• Secondary emails can be assigned to first-party SSO clients (using Passport clients where the user_id is null)
• When a client service tries to access a users email address, the correct email should be passed, as determined by the assignments