Megacap growth and technology stocks such as Microsoft MSFT.O, Amazon.com AMZN.O and Tesla TSLA.O added between 1.8% and 1.3%. By Johann M Cherian and Bansari Mayur Kamdar July 12 (Reuters) - Wall Street rallied on Wednesday, led by gains in rate-sensitive megacap growth stocks after data showed inflation cooled further in June and boosted hopes that the Federal Reserve was nearing the end of its monetary tightening cycle. The much awaited U.S. Labor Department report showed growth in core consumer prices, which excludes food and energy, eased to 4.8% from 5.3% in May on an annual basis.