Implement new cowbesite system on API

front/src/Api/Events/OpenCoWebsiteEvent.ts

@@ -0,0 +1,22 @@
+import * as tg from "generic-type-guard";
+
+export const isOpenCoWebsiteEvent = new tg.IsInterface()
+    .withProperties({
+        url: tg.isString,
+        allowApi: tg.isOptional(tg.isBoolean),
+        allowPolicy: tg.isOptional(tg.isString),
+        position: tg.isOptional(tg.isNumber)
+    })
+    .get();
+
+export const coWebsite = new tg.IsInterface()
+    .withProperties({
+        id: tg.isString,
+        position: tg.isNumber,
+    })
+    .get();
+
+/**
+ * A message sent from the iFrame to the game to add a message in the chat.
+ */
+export type OpenCoWebsiteEvent = tg.GuardedType<typeof isOpenCoWebsiteEvent>;