Provide a configurable way to display configuration values

[alvarosanchez]

Currently users are required to provide something like:

@Singleton
@Requires(env = Environment.DEVELOPMENT)
public class AllPlainEnvironmentEndpointFilter implements EnvironmentEndpointFilter {

    @Override
    public void specifyFiltering(@NonNull EnvironmentFilterSpecification specification) {
        specification.legacyMasking();
    }
}

But we could ship this implementation with the appropriate @Requires, and allow them to enable it via configuration.