fix(vite-plugin-cloudflare): setup asset proxy worker

[edmundhung]

Fixes #[insert GH or internal issue link(s)].

This fixes an issue in which service binding to a Worker running in Vite should serves the assets instead of hitting the user worker directly.

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• Wrangler / Vite E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because:
• Wrangler V3 Backport
  • TODO (before merge)
  • Wrangler PR:
  • Not necessary because:

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Latest commit: 7626542

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[pkg-pr-new]

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commit: 7626542