Added rust-like `unwrap()` for `Maybe` and `Either`

[AlexXanderGrib]

Why?

Better escape hatch than .value

Usage

function getUser(id: string): Either<UserError, User>;
const value = getUser(11).unwrap().name;

What else

• Fixed compiler and linter errors

[JSMonk]

Hi @AlexXanderGrib Thank you so much for this amazing PR. There are a few discussing points, but, anyway, it's so useful. Waiting for you response, and one more time, thank you a lot ^_^