Use binary packing for verification QR codes
Fixes https://github.com/vector-im/riot-web/issues/12257
Fixes https://github.com/vector-im/riot-web/issues/12375
We do not remove the existing QR code library in this commit because it is still used elsewhere (like the share dialog).
This should be as accurate as possible to what [MSC1543](https://github.com/matrix-org/matrix-doc/pull/1544) asks for.
