Reduce request watefall when lazy loading

[pi0]

Currently, we do lazy load shiki on client side when needed but there is a little bit of waterfall in chain that could be improved.

old:

updated with 3736ed8551b369afd29d0555debd9b0392162310:

fully fixed by https://github.com/shikijs/shiki/pull/624

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Reproduction:

pnpm nuxt build playground
pnpm nuxt preview playground

Source:

• cached loader: src
• composable: src
• options virtual: src

(edit something in the left pannel to see the network activity)