Combine the login and send fcm token in one api call

Send the firebase token on the login call. There is no need for two separate calls.

Use the new login endpoint:
`POST ​/api​/v2​/access​/authorize`

Send both login info & firebase related info:
```
{
  "user": "string",
  "password": "string",
  "channelName": "string",
  "fcmToken": "string"
}
```

Remove the call to `POST ​/api​/v1​/notification​/register`