“Minions: The Rise of Gru” is confusing before it even starts: Where exactly does this story fall within the “Despicable” timeline? It brings in the character of Gru as a youngster, inexplicably elaborating on his origin in a movie that’s supposed to be about little weirdos who say “banana!” all the time. Did this really need to be a saga? Film critic Jesse Hassenger reviews the latest from Illumination.