Start the quickinfo highlighing

[orta]

"Based" on @sandersn's lexer in https://github.com/sandersn/mini-typescript - this single file lib will take the quick info text and apply syntax highlighting to the typescript-like psuedo subset in there

We cna then use css-variables to decide the colors for the highlights

Also updates jest and pnpm

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[orta]

I think this could be simpler, realistically we could start out just looking for syntax chars (){}[]etc and say lowercase = identifier, uppercase = type and that's probably enough to test out if it works well.