[CORL-181] Comment Count Injection (#2581)

* feat: inject comment counts

* fix: tests

* feat: integrate stream embed with coral counts

* chore: refactor constants

* test: test for count bundle

* test: test live comment count integration with stream embed

* feat: use defer

* fix: snapshot

* feat: auto add count.js in when calling Coral.createStreamEmbed

* fix: tests

* fix: rm duplicate test

* chore: remove unuse file

src/core/client/count/injectJSONPCallback.ts

@@ -0,0 +1,18 @@
+import { COUNT_SELECTOR } from "coral-framework/constants";
+
+/** Injects a global CoralCount callback into the window object to be used in JSONP */
+function injectJSONPCallback() {
+  (window as any).CoralCount = {
+    setCount: (data: { ref: string; html: string }) => {
+      // Find all the elements with ref.
+      const elements = document.querySelectorAll(
+        `${COUNT_SELECTOR}[data-coral-ref='${data.ref}']`
+      );
+      Array.prototype.forEach.call(elements, (element: HTMLElement) => {
+        element.innerHTML = data.html;
+      });
+    },
+  };
+}
+
+export default injectJSONPCallback;