By Asif Shahzad and Gibran Naiyyar Peshimam ISLAMABAD (Reuters) -More than 100 lawmakers loyal to Pakistan’s ousted prime minister Imran Khan resigned on Monday, creating a headache for the new, Western-friendly incumbent Shehbaz Sharif as he tries to drag his country out of political and economic crisis. Parliament’s election of Sharif, 70, as prime minister on Monday followed a week-long constitutional crisis that reached a climax on Sunday when Khan, 69, lost a no-confidence vote in parliament. His departure from power sparked street protests and a mass resignation of MPs from Khan’s Pakist…