TAMPA — He has been a prodigy and a bust. A culprit of his own doing and a victim of cruel circumstances. He was once the best pitching prospect in the game, and was also dumped last week for next to nothing. Now, all these years later, Forrest Whitley just wants the chance to be the one thing that has mostly eluded him: A dependable big-league pitcher. Whitley was acquired by the Rays in a …