Embed React improvements (#2782)

* Add off support. Add getApi export.

* Add publish command

* Add embed-snippet in prod deps

* Update README

* Update package.json

Co-authored-by: Bailey Pumfleet <pumfleet@hey.com>
Co-authored-by: zomars <zomars@me.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/embeds/embed-react/src/index.ts

@@ -1,3 +1,17 @@
+import { CalWindow } from "@calcom/embed-snippet";
+
 import Cal from "./Cal";
 
+export const getCalApi = (): Promise<CalWindow["Cal"]> =>
+  new Promise(function tryReadingFromWindow(resolve) {
+    const api = (window as CalWindow).Cal;
+    if (!api) {
+      setTimeout(() => {
+        tryReadingFromWindow(resolve);
+      }, 50);
+      return;
+    }
+    resolve(api);
+  });
+
 export default Cal;