This node return the location and the value of the keyframes that composed the FCurve.
For instance, If one were to animate the x location of an object he would
insert a keyframe at the frame 0 when the object location was 0 and another
keyframe at the frame 20 when the location of the object was 5. An fcurve
would be created as a result of this animation and this node will return two
lists, KeyFrames Frames which will contain [0,20] which is the location
of our frames and KeyFrames Values which will contain [0,5] which is the
x locations of our frames.