By Pete Schroeder, Lananh Nguyen and Saeed Azhar WASHINGTON (Reuters) -The country’s top bank chiefs endorsed U.S. Federal Reserve rate hikes as a means to tame soaring inflation, while acknowledging there will be pain ahead, when appearing before Congress during a wide-ranging and mostly sedate hearing on Wednesday. The line-up before the House of Representatives Financial Services Committee included CEOs of the four largest U.S. banks: JPMorgan Chase & Co’s Jamie Dimon, Wells Fargo’s Charles Scharf, Bank of America’s Brian Moynihan and Citigroup’s Jane Fraser. They were joined by the CEOs of…