MINISERIES PREMIERE: Sam Rockwell plays choreographer and director Bob Fosse, and Michelle Williams plays dancer and actress (and, for a time, one of Fosse’s wives) Gwen Verdon. Together, they propel this new limited drama series, which sets out to absorb both the content and tone of Fosse’s own 1979 movie All That Jazz. Sometimes it’s very successful, and this Fosse/Verdon series certainly is entertaining on its own merits, in large part because of Williams’ uncannily co