Async Compute method in Computed Class

[Benno]

🆕 Feature Request

❓ Is your feature request related to a problem?

No

📄 Describe the solution you'd like

Make the Computed Class accept an async compute method.

const MY_COMPUTED = App.createComputed(() => {
  await xyz;
});

📃 Describe alternatives you've considered

no

[Benno]

#159