Replace ElementConfig with JSX.LibraryManagedAttributes

[SBoudrias]

Missing transform for compatibility with TS:

- type TestProps = React.ElementConfig<Test>;
+ type TestProps = JSX.LibraryManagedAttributes<typeof Test, Test["props"]>;

I found most details on microsoft/TypeScript#26704

[kevinbarabash]

In order to handle functional components the conversion will need to be:

type TestProps = React.ElementConfig<typeof Test>;
type TestProps = JSX.LibraryManagedAttributes<
    typeof Test,
    React.ComponentProps<typeof Test>
>;

[kevinbarabash]

Older versions of Flow allowed passing the component directly to React.ElementConfig<>, but now you have to pass the component's type.