YAOUNDE, Cameroon — A new coalition of European and Indo-Pacific nations has agreed to explore plans to strike a digital trade agreement, marking a significant step forward for the alliance of middle powers. Working on the sidelines of a World Trade Organization summit in Cameroon, the European Union and 12-nation CPTPP bloc — which includes the U.K. and Canada — have resolved to launch talks on a deal that would set rules for how digital services trade flows, how electronic contracts are