By Andrew MacAskill and Kylie MacLellan BIRMINGHAM, England (Reuters) -British Prime Minister Liz Truss triggered a new row in her party on Tuesday by suggesting she could limit increases in benefit payments by less than soaring inflation as she seeks ways to fund her tax-cutting growth plan. Britain’s new leader has endured a tumultuous time since she came to power on Sept. 6, first leading national mourning for Queen Elizabeth before releasing an economic package that immediately roiled financial markets. Seeking to snap Britain out of more than 10 years of economic stagnation, Truss and her…