✨ IMPROVE: Add support for Svelte chunks

[wlach]

Currently the syntax highlighting isn't quite right, probably
related to a bug in the underlying Svelte highlighter for vscode:

sveltejs/language-tools#1094

I'd like to fix the above issue before asking this to be merged, but
I thought I'd file this initial PR for feedback.

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[chrisjsewell]

cheers will have a check when you are ready to merge, but looks about right

[wlach]

I rabbitholed a bunch on why this wasn't working and am now pretty certain there's no issue with this plugin, the problem seems to be a limitation in VSCode which applies equally to markdown documents as it does to MyST ones. I'm sure it'll be figured out one way or another, but in the mean time I see no reason to delay merging this PR. Once the upstream issue(s) are fixed svelte syntax highlighting should start working as expected. In the mean time I think the incorrect syntax highlighting is still slightly preferable to not doing anything for these types of code chunks.

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