Normalize paths for windows dev server

[pi0]

Linked issues:

• Issue using programmatic addition of Nitro Plugins on a windows machine  nuxt/nuxt#15249
• initialization errors in nuxt 3.0.0 dev mode nuxt-modules/turnstile#85
  • Wrong paths on Windows Baroshem/nuxt-security#42
• Unable to build on Windows nuxt-modules/html-validator#232

They were fixed by #732 and #733 but since fixes introduced new issues (#808), reverting on 2.x edge until finding a new solution.

[pi0]

From linked issues, a common problem was, externals.inline is not being effective. inlined runtime dir by nuxt-turnstile using node's fileURLToPath has backslash and not matching fixed by 0638f64 and nuxt-security not including it at all (Baroshem/nuxt-security#84)

In addition, Nuxt has to automatically add transpile[] to externals.inline[] i belive for best DX. (we need downstream issue @danielroe )

Also while most of the cases with plugins and middleware need to be inlined, it seems there is still an strange behavior by rollup that even when returning {id: 'file://...', external: true} from resolver it trims it out from final bundle. I will try to investigate this more but probably better if we have a pure nitro reproduction first for this. It might be also a case with unimport.