Replace DeserializationResult with Result from Returns

[drhagen]

Serialite currently uses it own implementation of DeserializationResult. We should replace this with Result defined in the popular Returns library. Parsita previously made this migration. This would integrate Serialite into the Returns ecosystem.

Any return types of DeserializationResult[Output] would be replaced with Result[Output, DeserializationError]. Just like Parsita, we should reexport serialite.Result = result.Result[Output, DeserializationError], Success = result.Success, and Failure = result.Failure[DeserializationError].

The biggest loss would be the or_die method. In Returns, the syntax for returning the success value or raising the failure is rather ugly: result.alt(raise_exception).unwrap().