Expose olm WASM to push notif service-worker on web.

Summary: This differential enables olm usage in notifications service-worker on web.

Test Plan:

1. Apply this diff (in order to actually initialize olm with WASM file since eventually it will be initialised when receiving notification in next diff): https://gist.github.com/marcinwasowicz/20ee184547487d05aa5421af8c77b107
2. Open web app.
3. In new tab open chrome://inspect/#workers
4. Go to Service Workers then worker/notif and finally click inspect. This should open a console.
5. Finally reload web app and ensure that no error is logged.

Repeat for prod and dev

Reviewers: kamil, michal

Reviewed By: kamil

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9633