Add support for rust code generation

[harlem88]

The rust code generated by proto files wad added under version control, on each pull_request a CI action will check if there is a difference between the code generated by CI and the rust code committed in the Pull Request.

[rgallor]

Seems good to me.

[sorru94]

Renaming some of the checkers could make the CI clearer. The three checkers below are very similar.

• check-code-generation.yaml
• rust-check-build.yaml
• rust-code-check.yaml

check-code-generation.yaml will also eventually contain the check for Python right? If so then the generic name looks good.
I would rename rust-check-build.yaml to something more explicative. The check is on the build tools, not the building process. How about something like rust-check-builder.yaml, rust-check-tools.yaml.
For rust-code-check.yaml the name could be similar to check-code-generation.yaml since the purpose is the same but only for Rust files. How about something like rust-check-code-generation.yaml?

My suggestion is also for the workflow name contained in the .yaml files. Those names could be similar to the file name in order to make the file easy to find knowing only the name and vice-versa.