Publish qr package

[andreasKroepelin]

There are currently two published Typst packages for generating QR codes, to my knowledge. One is native Typst (probably not the fastest) and one calls a whole JavaScript runtime. Your implementation using Rust and wasm looks very reasonable and nicely done to me so I'd love to see it in the official package repository!

[EpicEricEE]

You're right that this package is probably more efficient than the other two, but a new package has just been created, which I think is even better suited than this. It contains many more types of codes, though it seems to lack color customization as of now:

tiaoma:0.1.0