Draft: Rust implementation

I made this just to get some attention regarding having a Rust implementation. This is useful in many cases and I think that could be reasonable to split this repository in many others:

• one for the message definitions (core one)
• other for implementation
  • one for the C++ implementation
  • one for the Python implementation
  • one for the Rust implementation
  • with many other in future (maybe)

This could be beneficial in many ways:

• have a common definition (lightweight especially) to rely on
• have different repos all having the definitions as submodule
• do not have this repo as a submodule if I need just the definitions

Let me know what you think.