fix(types): Datum.toComponent() should return ReactElement instead of Component

[Josh-Cena]

React.Component is something like function Comp() {...} or class Comp extends Component, while React.ReactElement is like <Comp />, the "return value" of a component. This has blocked me from doing something like React.Children.toArray(datum).

[Josh-Cena]

@staylor Could you take a look at this, please?

[OliverJAsh]

FWIW the same fix was made to react-helmet. DefinitelyTyped/DefinitelyTyped@b0ff447

[Josh-Cena]

It's been two years and after the types refactor the bug is still actual. @staylor?

[daniel-ac-martin]

I've also it this. Would be nice if it could be fixed.

I wonder if the method's name should also change though!