fix: use file extensions on type imports so they work with moduleResolution: 'node16'

[Princesseuh]

Description

At Astro we're currently (attempting) to migrate our tsconfig.json to moduleResolution: 'node16'. We got it mostly figured out, apart from one thing: We can't import types from Vite. Investigating led me to realize that it was because Vite's type imports don't have file extensions, so they always resolve as any under moduleResolution: 'node16'. I tried to workaround this by importing the files in the types folder individually, but they're not part of the exports map so.

This PR adds file extensions to all the imports, easy enough. I tested it downstream and it works. Per #11552, it seems like many users were patching Vite manually for this already.

Additional context

Downstream is currently not able to migrate to moduleResolution: 'node16', so this is kinda blocking.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[Princesseuh]

Hmm, I'm not too sure why the CI is yelling at me. The same tests works fine in local:

(and the build works etc)

[patak-dev]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
analogjs	❌ failure
astro	✅ success
histoire	❌ failure
iles	❌ failure
ladle	✅ success
laravel	✅ success
marko	✅ success
nuxt	✅ success
nx	✅ success
previewjs	✅ success
qwik	✅ success
rakkas	✅ success
sveltekit	✅ success
unocss	✅ success
vite-plugin-pwa	✅ success
vite-plugin-ssr	✅ success
vite-plugin-react	✅ success
vite-plugin-react-pages	❌ failure
vite-plugin-react-swc	✅ success
vite-plugin-svelte	✅ success
vite-plugin-vue	✅ success
vite-setup-catalogue	✅ success
vitepress	✅ success
vitest	✅ success

[patak-dev]

Same projects are currently failing against main. Let's merge this one. Thanks @Princesseuh!