Input function for pose values.
Example of input: Pose(Point(1 1), 0.5) Pose(Point(1 1 1), 0.5, 0.5, 0.5, 0.5) SRID=5676;Pose(Point(1 1 1), 0.5, 0.5, 0.5, 0.5) @sqlfn pose_in()