Add authorization endpoint to

[EvilLord666]

According to Authrorization Flow we should implement keycloak like Authorization Endpoint

~/auth/realms/{{realm}}/protocol/openid-connect/auth?response_type=code&client_id=jwtClient

Moreover, this endpoint accepts scope and redirect_uri as optional parameters.

We won’t use this endpoint in Postman. Instead, we usually initiate the authorization code flow via a browser. Then Ferrum redirects the user to a login page if no active login cookie is available. Finally, the authorization code is delivered to the redirect URL.