By Echo Wang (Reuters) – Wall Street stocks ended with sharp gains on Monday at the start of the final quarter of a tumultuous year with interest rate hikes amid historically hot inflation and fears of slowing economic growth. All 11 major S&P 500 sectors advanced to positive territory, with energy being the biggest gainer. Data showed manufacturing activity increased at its slowest pace in nearly 2-1/2 years in September as new orders contracted, likely as rising interest rates to tame inflation cooled demand for goods. The Institute for Supply Management said its manufacturing PMI dropped to…