Grupo Krapp isn’t the sort of company that comes around very often, especially not from Argentina, land of the tango. Named afterSamuel Beckett’s play “Krapp’s Last Tape,” this experimental group, consisting of actors, dancers and musicians, is an endearing, excellent collective. As part of its Latino Cultural Festival, Queens Theater in the Park played host to the troupe on Wednesday, and New York audiences finally witnessed what the fuss was about.