Testsuite PoC - Distribution server supplier

[lhanusov]

Add a new server supplier that provides a Keycloak test server running as an external service. This would require #30609 to be implemented first. Alternatively we can have a basic system property that switches the single supplier for now, with refactoring once #30609 is done.

It should unpack the server distribution and start it as a separate process, as well as support configuration from the KeycloakTestServerConfig.class.

Like the embedded server supplier this should use the functionality from the quarkus/test/junit5.

[stianst]

We would still want to support the configuration classes, so it needs to pass CLI arguments, enable features, etc.