Language support for Rust

[itsezc]

🤔 What's the problem you're trying to solve?

Currently Rust is not supported so syntax highlighting is poor / non existent, although the usage for Cucumber in the Rust community is pretty large: https://github.com/cucumber-rs/cucumber

✨ What's your proposed solution?

Adding support for Rust in the Cucumber language server

⛏ Have you considered any alternatives or workarounds?

• There are a number of non first party / obscure Cucumber extensions for Rust on VSCode

📚 Any additional context?

N/A

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[aslakhellesoy]

If anyone wants to tackle this - start here

[aslakhellesoy]

Moved to #82