feat: add ESM support

[userquin]

This PR also fixes the injectRegister on development: we have a race condition, it seem Vite will call the transform on dev before the virtual and so will always generate the registerSW.js.

I have added some hints on the docs: if not importing any virtual module and using dev the user MUST explicitly configure injectRegister with inline or script.

[netlify]

✅ Deploy Preview for vite-plugin-pwa ready!

Name	Link
🔨 Latest commit	7b66c9e
🔍 Latest deploy log	https://app.netlify.com/sites/vite-plugin-pwa/deploys/62be091a8b9b3100097ae06c
😎 Deploy Preview	https://deploy-preview-319--vite-plugin-pwa.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[userquin]

I'll check this PR on vitesse, just some tests on local using type module and commonjs on an svelte project.

EDIT: also tested with all examples in the repo, generateSW and injectManifest with prompt for all frameworks.

EDIT2: vitesse working also with mode cjs and esm

[userquin]

@antfu On draft, I need to check the client types, can you check it on vscode?

[userquin]

I'll split this PR in 2 and so we can merge the fix for dev mode

[userquin]

supersed by #327

/cc @natemoo-re @benmccann