feat: better getBestResponse #25
Description
Currently, getBestResponse fails when the task is not completed, but this is really bad for UI & UX.
Instead, it should return the task status along with the best response it has at that point.
(PendingGeneration, firstGeneration | "")(PendingValidation, firstGeneration)(Completed, highestScoreGeneration)
In the currenty implementation the first two cases throw an error which need to be handled and it sucks.