@recoiljs/refine's types export Path while the library itself doesn't

[brncsk]

I use refine's Path class for my zod ↔ refine adapter (see #1833).

As of 0.1.0, the TS types of @recoiljs/refine seem to indicate that Path is exported, however it is not:

import { Path } from '@recoiljs/refine';

console.log(Path); // → undefined

Please either export Path or remove it from the type declarations – either is fine by me as I was already mocking it in the library. Thanks, folks!

[drarmstr]

Path is currently exported as a type, but not the actual class implementation. I think we want to continue exporting the type so it can be used in custom checker implementations. @bsouthga, what are your thoughts on exporting the actual class?