Support for async view functions

[mason-alex]

Title:
Support for async view functions.

Description:
If you designate a view as async, then the it will not render. No errors are printed to console(Ctrl+Shift+I). You can momentarily see "View is Rendering" before it disappears.

Example of non working code:

return async function View() {
    return <p>Hello!</p>;
}

Actual Behavior:
No view is rendered when the function is designated as async.

Expected Behavior:
The view would render and allow for asynchronous async / await patterns in views.