* [feat] Add support for [client policies](https://www.keycloak.org/docs/latest/server_admin/#_client_policies).
* Provide a [client policy condition](https://www.keycloak.org/docs/latest/server_admin/#condition) named `restrict-client-auth-enabled` to check whether user authentication on a client has been restricted or not.
* Provide a [client policy executor](https://www.keycfloak.org/docs/latest/server_admin/#executor) named `restrict-client-auth-auto-config` to automatically enable restricted access for clients.