`from` keyword in import tags and `of` keyword in for loop tags are not highlighted

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Same vein as ventojs/vscode-vento#11, with the addition of of. Possibly other keyword too, I'll do a proper check. I don't have a minute to work on this myself yet (likely until this weekend) but thought I'd mention it in case you have some time on your hands!

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Hey, thanks for making an issue! The grammar here is pretty naive, since it only assumes a few keywords are part of vento (in theory, it's very flexible due to extensions), so currently it relies a bit on tree-sitter-javascript to fill in the gaps.

I can add the the special cases like from and such, since those are handled natively in vento, and should be added. Let me know which ones you're missing and I'll add em :).

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Gotcha yeah, I was taking a peek around earlier - I've been working with Tree-sitter grammars frequently recently so I'm getting used to it 😅 Would be great if you could add those two keywords, not any others I can think of at the minute.