[web] Add qrcode.react dependency

Summary:
We'll use the qrcode.react package to generate QR codes on the web client for the new login flow.

The discussion for this dependency is on linear: https://linear.app/comm/issue/ENG-4474/research-packages-to-generate-qr-codes-on-secondary-devices

Test Plan: Ran yarn cleaninstall and made sure the component was able to be imported

Reviewers: atul, ginsu, tomek, varun, ashoat

Reviewed By: ginsu, ashoat

Differential Revision: https://phab.comm.dev/D8763