feat: automatic create tsconfig for editor support on functions

[lukasholzer]

Fixes https://github.com/netlify/pod-dev-foundations/issues/595

🎉 Thanks for submitting a pull request! 🎉

Summary

Fixes the editor support for the new functions V2 API. By that we enforce that the editor is in sync with the build values

---

For us to review and ship your PR efficiently, please perform the following steps:

• [ ] Open a bug/issue before writing your code 🧑‍💻. This ensures we can discuss the changes and get feedback from everyone that should be involved. If you`re fixing a typo or something that`s on fire 🔥 (e.g. incident related), you can skip this step.
• [ ] Read the contribution guidelines 📖. This ensures your code follows our style guide and passes our tests.
• [ ] Update or add tests (if any source code was changed or added) 🧪
• [ ] Update or add documentation (if features were changed or added) 📝
• [ ] Make sure the status checks below are successful ✅

A picture of a cute animal (not mandatory, but encouraged)

[github-actions[bot]]

📊 Benchmark results

Comparing with 2a688760c93fd64b60fe7db41b033aa73c6aab8d

• Dependency count: 1,369 (no change)
• Package size: 379 MB ⬇️ 0.00% decrease vs. 2a688760c93fd64b60fe7db41b033aa73c6aab8d

[lukasholzer]

With that configuration, I get even in JavaScript completion for the Netlify.env

[sarahetter]

@lukasholzer is this PR still relevant, or should we close/draft?

[lukasholzer]

@sarahetter yes but sadly never had time to finish it up