Twenty-nine films into the Marvel Cinematic Universe — a playful and flexible narrative arena in theory, too often a realm of granite solemnity in practice — if you can’t mess around a little then really: Why make all that money in the first place? In other words, the giant screaming goats hit the spot in “Thor: Love and Thunder,” which should be called “Thor: Love, Thunder, Goats, Guns N’ Roses.” The digital vessel-haulers known as Toothgrinder and Toothgnasher enjoy a modest but welcome amount of screen time in co-writer and director Taika Waititi’s aggressively nutty follow-up to “Thor: Rag…
