By Uditha Jayasinghe and Dinuka Liyanawatte COLOMBO (Reuters) -Police imposed an overnight curfew in several parts of Sri Lanka’s main city of Colombo early on Friday after protests over the government’s handling of the country’s worst economic crisis in decades turned violent, an official said. Hundreds of protesters gathered near President Gotabaya Rajapaksa’s private residence in a Colombo suburb late on Thursday and were broken up by police using tear gas and water cannons, a Reuters witness said. Amal Edirimanne, a senior superintendent of police, said a curfew had been imposed in four po…