“If folks may put rainbows in zoos, they’d do it,” quips the anthropomorphic stuffed tiger of “Calvin and Hobbes” in one of many bygone every day sketch’s most well-known panels. His level is effectively taken; in Apple TV’s “Monarch: Legacy of Monsters,” of us affiliated with varied company and bureaucratic entities attempt endlessly to both cultivate or destroy the Titans, big radioactive monsters that’ve roamed the Earth for ages, with calamitous outcomes.