5560-sync_mail_with_account_manager

issue: https://gitlab.e.foundation/e/backlog/-/issues/5560

Introduce new broadCast receiver which will be called from
accountManager & settings app when new account is confiured, or any
account is removed, so that mail app accounts also got synced with them.

- new AccountSyncReceiver implemented
- refactor EeloAccountCreator code
- Bug fix: invalid account created automatically on accountSync call
- Bug fix: on new account creation account name always updated with
  email