backport #23629 To make versioned documentation less surprising, 1.19 should have the same technology.
This PR implements a [Cargo registry](https://doc.rust-lang.org/cargo/) to manage Rust packages. This package type was a little bit more complicated because Cargo needs an additional Git repository to store its package index. Screenshots: ![grafik](https://user-images.githubusercontent.com/1666336/203102004-08d812ac-c066-4969-9bda-2fed818554eb.png) ![grafik](https://user-images.githubusercontent.com/1666336/203102141-d9970f14-dca6-4174-b17a-50ba1bd79087.png) ![grafik](https://user-images.githubusercontent.com/1666336/203102244-dc05743b-78b6-4d97-998e-ef76341a978f.png) --------- Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>