I've come across an issue where the `identifier` wasn't equal to the `audience` in the token.
This resulted in verification errors because currently it will verify the `aud` against the `identifier` if no `audience` is specified.

In this PR, I introduced the `audience` as `client_options` and will pass this along in the `verify!` of the `decoded_id_token` so the openid_connect gem [can handle the expected audience](https://github.com/nov/openid_connect/blob/e1eb8ea962af43752b1aed2c1063a3e24f96c5bc/lib/openid_connect/response_object/id_token.rb#L30-L32)

Co-authored-by: Roger Meier <[email protected]>