Adds lpoprpush, rpoprpush and lpoplpush commands #2664
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These new commands are symmetrical to the rpoplpush command, and they've been implemented using a generic method with the existing pattern of a flag being REDIS_HEAD or REDIS_TAIL to indicate the start or end of a list. But I still need help resolving the blocking methods (blpoprpush an so on) and creating tests, because I'm don't know anything about tcl.
I implemented the blocking commands, but I still need to adapt the
serveClientBlockedOnList
function so that it knows the difference between all methods (it currently supports only the rpoplpush command).