By Leika Kihara TOKYO (Reuters) -The Bank of Japan could raise interest rates in October even if Sanae Takaichi, a proponent of aggressive monetary easing, wins the ruling party's leadership race and becomes the next premier, former central bank executive Tomoyuki Shimoda said on Thursday. Seen as a leading candidate to win the race on October 4, Takaichi stands out for her vocal opposition to the BOJ's rate hikes and her calls to ramp up spending to reflate the economy. The prospect of her becoming Jap ...