Support for Oauth Audiences

[luissantos]

Is your feature request related to a problem? Please describe.

For security purposes, Oauth servers require an audience to be provided so that a JWT token can be issued.
If the audience is not provided the server won't issue a standard JWT token.

Describe the solution you'd like
Allow developers to specify the audience in the configuration file and forward the audience while redirecting to the user to oauth provider server.

Describe alternatives you've considered
There are no alternatives. I've validated that this works by intercepting the redirect and injecting the audience parameter.

Additional context
Without the audience its not possible to integrated with services like Auth0.
https://auth0.com/docs/get-started/authentication-and-authorization-flow/authorization-code-flow/call-your-api-using-the-authorization-code-flow#authorize-user

Example from the Auth0 documentation:

<a href="https://{yourDomain}/authorize?
  response_type=code&
  client_id={yourClientId}&
  redirect_uri={https://yourApp/callback}&  
  scope=appointments%20contacts&
  audience=appointments:api&
  state=xyzABC123">
  Sign In
</a>