Add username to passkey (#11)

Author: stevenclouston

app/src/main/java/com/authsignal/keycloak/AuthsignalAuthenticator.java

@@ -88,6 +88,7 @@ public void authenticate(AuthenticationFlowContext context) {
       request.attributes.userAgent =
           context.getHttpRequest().getHttpHeaders().getHeaderString("User-Agent");
       request.userId = context.getUser().getId();
+      request.attributes.username = context.getUser().getUsername();
 
       try {
         CompletableFuture<TrackResponse> responseFuture = authsignalClient.track(request);