Update C3 OpenAPI template to allow users to pick either Hono or itty-router

[G4brym]

What this PR solves / how to test

This pr updates the C3 OpenAPI template to allow users to pick either Hono or itty-router.

Example usage: npm create cloudflare@latest -- --type openapi --framework hono npm create cloudflare@latest -- --type openapi --framework itty-router

Author has addressed the following

• Tests
  • [ ] TODO (before merge)
  • [ ] Included
  • [x] Not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • [ ] I don't know
  • [ ] Required / Maybe required
  • [x] Not required because:
• Changeset (Changeset guidelines)
  • [ ] TODO (before merge)
  • [x] Included
  • [ ] Not necessary because:
• Public documentation
  • [ ] TODO (before merge)
  • [ ] Cloudflare docs PR(s):
  • [x] Not necessary because: