serialize bigint AST, albeit incorrectly

[Rich-Harris]

playgrounds/sandbox/run.js doesn't work for components containing bigints, because they can't be serialized to JSON. There isn't really a great fix for this issue but this at least allows the sandbox to run

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[Rich-Harris]

preview: https://svelte-dev-git-preview-svelte-14504-svelte.vercel.app/

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