Register prop-types when set through Flow SuperTypeParameters

[gpeal]

This picks up prop types when set using flow SuperTypeParameters such as:

type Props = { /* ... */ };

class MyComponent extends React.Component<void, Props, void> {
  ...
}

@ljharb This is modified from the property annotation checks. However, I couldn't test the wrapped TypeAnnotation or NullableTypeAnnotation resolution checks.

[ljharb]

Thanks, this looks great!

[ljharb]

I'm going to merge this today if there's no objections.

[ljharb]

@yannickcr any chance of a release soon, to get this fix in?