fix(vite-plugin): set rollupOptions.platform: "neutral" on rolldown-vite

[hi-ogawa]

Fixes vitejs/rolldown-vite#248

The issue is reported on rolldown-vite repository vitejs/rolldown-vite#248. Rolldown has esbuild-like platform option to control the default behavior such as require polyfill. Rolldown-vite server build uses platform: "node" by default and it causes an issue with cloudflare plugin due to node:module appearing in resolveId, which gets externalized and not being tree-shaken (cf. #9609). By setting platform: "neutral", it avoids cloudflare plugin to see resolveId("node:module") and fixes the issue (though tree-shaking issue still exists when nodejs_compat is not enabled).

There's also new optimizeDeps.rollupOptions.platform, but rolldown-vite automatically copies it from optimizeDeps.esbuildOptions.platform, so it's not necessary to be changed yet.

I manually tested the local build with my reproduction.

---

• Tests
  • Tests included
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because:
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because:

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