Feature Proposal: Add unwrapOrElse method to Result

[JesseGovindan]

Introduce a new instance method on Result and ResultAsync

unwrapOrElse<U>(op: (err: E) => U): T | U

• Success (Ok): returns the contained T.
• Failure (Err): calls the provided callback op with the error E and returns the callback’s return value.

This would prevent having to use .match with a callback such as (value) => value, in the first parameter.