Prop opt out

We are finding that our prop types are getting increasingly complex and sophisticated. At some point `extract-react-types` does not use the TypeScript compiler and it is not reasonable for it to understand the whole breadth of the language.

Can I suggest an opt out?

```ts
type Props = {
/* @readonly
….
*/
name: SomeSuperComplexType
}
```

Perhaps we could put some information in the jsdoc above a prop to tell `extract-react-types` to not bother trying to understand the type and just print it out as a raw string