The Hulu series “ Alice and Steve ” has many aspects of a romantic comedy: witty banter, protagonists with quirky creative jobs and a set piece centered on a dinner party. But the namesake characters are not, in fact, the lovebirds whose ill-advised union serves as the show’s inciting incident. They’re two middle-aged Londoners whose decades-long best friendship is put to the ultimate test when Steve ( Jemaine Clement ), a divorced and childless celebrity hairstylist who yearns for a nuclear