Add animation stride property and its UI
Add a stride property to the animation player to change the granularity of the animation for sequence and snap-to-timesteps mode.
At the beginning/end of the animation frame list, if the requested frame dos not exist the frame will not change (i.e. when at the 8th out of 9 keyframe with stride >= 2, pressing Go To Next Frame
will do nothing).
Resolves: #20798 (closed)