Add methods for working with Swift.Result

[lilyball]

We should consider adding variants of all the throwing methods that return a Swift.Result instead.

[lilyball]

Upon consideration, this is a lot of methods. Maybe instead we should consider converting all throwing methods to returning Result and relying on the user to call .get() if they want to throw the error.

I'm going to push this off for later consideration since that's a major change. I'd love some feedback on the idea though.