Hook up h3 router and callbacks

src/Http3ContextData.h

@@ -1,9 +1,21 @@
 #include "HttpRouter.h"
 
+struct Http3Response;
+struct Http3Request;
+
 namespace uWS {
 
     struct Http3ContextData {
-        HttpRouter<int> router;
+        struct RouterData {
+            Http3Response *res;
+            Http3Request *req;
+        };
+
+        HttpRouter<RouterData> router;
+
+        Http3ContextData() {
+            printf("Constructing http3contextdata: %p\n", this);
+        }
     };
     
 }