sendAs support of alias emails #1298
Description
every time the app is started, we should fetch https://developers.google.com/gmail/api/reference/rest/v1/users.settings.sendAs/list in the background and save list of sending emails for that account in Realm.
Then during compose, if the user has more than one sending address, we can give them choice which email to send from.
See settings at https://mail.google.com/mail/u/0/#settings/accounts where you can add a secondary sending email, which will then show up when that API is loaded.
You can try Gmail app, FlowCrypt Android app or FlowCrypt browser extension for existing implementations.