Get `typst` packaged for Debian and other repos

Description

In order to get typst installable via the Debian repos, all dependencies in Cargo.lock need to be available at https://qa.debian.org/developer.php?email=pkg-rust-maintainers%40alioth-lists.debian.net. The majority exist already, but from a cursory look maybe about 20% will need to be added if they can't be configured out.

This happens by adding dependencies in salsa via debcargo https://salsa.debian.org/rust-team/debcargo-conf which anyone can do. Once all the missing dependencies are in, Typst itself can be added.

There is an existing RTP at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1060888

There is also an incomplete https://github.com/jcbhmr/typst.deb, which I believe would be for a PPA. Being in the main repos is of course a better goal, if possible.

Use Case

It would be an awesome convenience to be able to install Typst via apt. I know the Typst maintainers will likely not want to get involved, but I think it seems reasonable to have a "help wanted" tracking issue.

Start by checking Cargo.lock against the Debian Rust package availability page, then review the existing RTP and the debcargo-conf repository. Add or configure missing salsa dependencies through debcargo, and verify that all dependencies are available before preparing Typst for the Debian repositories; the incomplete typst.deb project is an alternative reference.