After The Garden is Train Wreck Theater, but very much intentionally so. After all, look at the subject matter. We’ve got a one-man show, which is a recreation of an actual, historic one-woman show, and that woman is a beloved eccentric known for her unabashed lack of modesty, her years of living in squalor, her dysfunctional relationship with her mother. It’s Little Edie Beale, familiar to anyone who’s experienced the Grey Gardens documentary, or…