feat: add vyper grammar

[KevinBatdorf]

This adds the vyper grammar found here.

I'm not personally familiar with this language, but it looks like that it uses a .vy extension. Should that be added somewhere?

• I have read docs for adding a language.
• I have searched around and this is the most up-to-date, actively maintained version of the language grammar.
• I have added a sample file that includes a variety of language syntaxes and succinctly captures the idiosyncrasy of a language. See docs for requirement.

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[octref]

In grammarSources.ts, you can find languageAliases. Feel free to add that!

[KevinBatdorf]

Thanks, added that now. Good to check again when you're ready.

[octref]

Awesome work as always thanks!