Automating ngrok authentication retrival for configuration

- Currently, while configuring dash we are asking the user to enter the authentication token manually.
- The *Objective* of this Issue is to automate this issue and in place of entering auth token we take `Username` and `password` of their Ngrok account and get the auth token automatically.
- When user does not pass any value to `username` and `pass` then ask them to enter `authtoken` after getting it manually.

Look for the configuration flow in the CLI code, likely in a module handling user setup or authentication. Identify where the ngrok authtoken is currently prompted and stored. Research ngrok's API or CLI for programmatically obtaining an auth token given username and password. The change involves adding a new authentication method, handling fallback to manual token entry, and updating any configuration files or environment variables.

Scritto dal modello di indicizzazione a partire dal testo della issue.