In the past, I’ve lamented the decline of the PG adventure movie. Kids are either shunted off into family-friendly animated features or they’re thrust into the blockbuster fare of PG-13 summer tentpoles. It’s getting harder to find movies that are appropriate for the 9-12 set while also being terrific. Enter Enola Holmes, a cinematic and electrifying adaptation of a YA book series that focuses on Sherlock Holmes’ kid sister. Developed as a feature in part by star Millie Bobby Brown (who also serves as a producer on the film), Enola Holmes is a pure …