Jemima Kirke, the irreverent aesthete who doesn’t seem to take herself or show-business seriously, has all that she needs to have an enviable career as actress. But does she want any of it? I presume not, and that’s what makes her such a strong candidate for this column. From her role in Lena Dunham’s “Tiny Furniture” (2010) in which she plays the lead character’s tuned-out dropped-in foil, to her recent turn in the HBO series “Girls,” Kirke has demonstrated that she has the acting chops and could land some primo roles in the future. And yet, if you raised the subject of acting in private she’d probably steer the conversation towards some new artist she