Call Rust code from C#

[hypehuman]

Prove that we can call functions in a Rust library from C#.

Possibly helpful:

• https://medium.com/dotnetdevelopers/how-to-call-a-rust-generated-library-from-c-cdbf90a6f038
• https://dev.to/living_syn/calling-rust-from-c-6hk

[hypehuman]

Merged to dev at 2f0f5ca895496aa1d7a0b1d63b9450b17bf30386