A cubic animation curve that starts slowly and ends quickly. This curve is
based on a cubic equation where
f(t) = t³. The result is a safe sweet
spot when choosing a curve for widgets animating off the viewport.
Compared to Curves.easeInQuad, this curve is slightly steeper.
Derived from Robert Penner’s easing functions.
static const Cubic easeInCubic = Cubic(0.55, 0.055, 0.675, 0.19);