By Satoshi Sugiyama and Andrea Shalal TOKYO/NARA (Reuters) -Mourners streamed into a temple in Tokyo to pay their respects to Japan’s slain former premier Shinzo Abe on Monday, as his assassination overshadowed an election win for the ruling party he had dominated. Current Prime Minister Fumio Kishida, who has the chance to cement his own power following Sunday’s election gains, and U.S. Treasury Secretary Janet Yellen were among the hundreds at Abe’s wake, three days after he was shot at an election rally. A private funeral for Abe, who resigned in 2020 and was Japan’s longest-serving premier…