Alibaba Group Holding Ltd. will roll out a new employee incentive plan starting April that combines equity with cash, a significant adjustment designed to help the e-commerce giant attract and retain talent despite fierce competition.The Hangzhou-based company told employees in a company-wide memo the changes are aimed at “improving the certainty and liquidity” of its compensation, according to people who’ve seen the message. Starting April 1, staff get “long-term cash” in addition to stock opti...