JERUSALEM — The wife of Prime Minister Benjamin Netanyahu was charged Thursday with misusing some $100,000 in public funds to order lavish meals from celebrity chefs, dealing an embarrassing blow to the country’s first family and drawing fresh attention to a series of separate corruption investigations plaguing the prime minister. Although the indictment against Sara Netanyahu did not directly affect the prime minister, it ended a period of political victories that had bolstered the Israeli leader and distracted attention from his legal woes.