Hulu.The three-part program “Sasquatch,” premiering Tuesday, April 20, explores a wild theory that the mythical creature may be responsible for long-rumored murders and disappearances of three unidentified Mexican men in northern California in 1993. But is Bigfoot really the prime suspect in a decades-old string of cold cases about men reportedly torn limb from limb, for whom no bodies were ever found — and which exist only as horrific hearsay?That depends on who you ask.The out-there legend of