Export IdToken and User types

[4javier]

Add TokenId interface and User class export from auth0-spa-js

Description

Exporting IdToken interface and User class from auth0-spa-js makes IDEs auto-import working.

These definitions can come in handy when the consumer of the library needs to expand the objects emitted by idTokenClaims$ and user$ observables respectively, adding properties reflecting custom claims.

Testing

authVm$: Observable<IdToken & {roles: string}>;
this.authVm$ = this.auth.idTokenClaims$.pipe(
  map(claims => ({...claims, roles: claims['https://yourUrl.com/roles']}))
);