Add list of authorized scopes to tokens object

[pavelsr]

Old:

"tokens": {
        "email_1@gmail.com": {
            "refresh_token": "1/cI5jWSVnsUyCbasCQpDmz8uhQyfnWWphxvb1ST3oTHE",
            "access_token": "ya29.Ci-KA8aJYEAyZoxkMsYbbU9H_zj2t9-7u1aKUtrOtak3pDhJvCEPIdkW-xg2lRQdrA"
        },
        "email_2@gmail.com": {
            "access_token": "ya29.Ci-KAzT9JpaPriZ-ugON4FnANBXZexTZOz-E6U4M-hjplbIcMYpTbo0AmGV__tV5FA",
            "refresh_token": "1/_37lsRFSRaUJkAAAuJIRXRUueft5eLWaIsJ0lkJmEMU"
        }
    }

New:

"tokens": {
        "email_1@gmail.com": {
            "refresh_token": "1/cI5jWSVnsUyCbasCQpDmz8uhQyfnWWphxvb1ST3oTHE",
            "access_token": "ya29.Ci-KA8aJYEAyZoxkMsYbbU9H_zj2t9-7u1aKUtrOtak3pDhJvCEPIdkW-xg2lRQdrA",
           "authorized_scopes":  [ "email", "profile", "https://www.googleapis.com/auth/calendar" ]
        },
        "email_2@gmail.com": {
            "access_token": "ya29.Ci-KAzT9JpaPriZ-ugON4FnANBXZexTZOz-E6U4M-hjplbIcMYpTbo0AmGV__tV5FA",
            "refresh_token": "1/_37lsRFSRaUJkAAAuJIRXRUueft5eLWaIsJ0lkJmEMU",
            "authorized_scopes":  [ "email"  ]
        }
    }

[pscott-au]

In WebService::GoogleAPI::Client I decided to include the scopes above the users in the hierarchy.
The reasoning for this is that the scopes are typically defined at the project level and although user access will typically include a subset of these, it is probably more convenient to manage multiple differently scoped files for a project rather than define them in the config file which requires the management of scopes in a more complicated way at the web auth collection stage.