BY DAVID THORPE

Pascal Siakam made eight straight shots, then nine, then 11 on his way to 32 points. In one of the loudest arenas in NBA history, the Raptors took Game 1 over the Warriors Thursday night 118-109. Through it all, one thought loomed largest: Kawhi Leonard will be a Raptor next year.

Of course, he’s about to be a free agent. And because of t…