Implement Auth.AcceptLoginToken

[aykutalparslan]

Accept QR code login token, logging in the app that generated it.

Returns info about the new session.

For more info, see login via QR code.

authorization#ad01d61d flags:# current:flags.0?true official_app:flags.1?true password_pending:flags.2?true encrypted_requests_disabled:flags.3?true call_requests_disabled:flags.4?true hash:long device_model:string platform:string system_version:string api_id:int app_name:string app_version:string date_created:int date_active:int ip:string country:string region:string = Authorization;
---functions---
auth.acceptLoginToken#e894ad4d token:bytes = Authorization;