(Adds editing credit) By Jaspreet Kalra and Ashwin Manikandan MUMBAI (Reuters) -At the world's largest gathering for the financial technology sector in Mumbai this week, more than 800 speakers tip-toed around two topics that have captured attention globally: cryptocurrencies and stablecoins. About 100,000 participants converged for the three-day conference starting October 7 in India's financial capital, headlined by the prime ministers of India and the United Kingdom, and drawing regulators, investors ...