Graduate Step Slider (#9983)

* merged step slider into pinch slider and graduated from experimental

* updated slider sounds and prefab to line up with the prefab's tick marks. Sounds now play with slider step increments

* Fixed the draw call to be OnDrawGizmos, first steps for touch slider graduation

* added back custon pinch slider prefab, revamped slider to allow for snapping and incorporated touch slider components

* updated pinch slider script and prefab

* finished graduating the slider examples scene

* moved the pinch slider inspector back to it's rightful place

* removed extra line

* moving and graduating out touch slider components

* added new unit tests for the pinch slider

* removed unneeded readme and adjusted scene

* fixing edge cases with the touch collider, fixing animations to not also increase the size of the collision box (causing edge cases involving interaction collisions)

* slider test adjustments

* style fix

* adjusted tests to account for the no snap setting

Author: RogPodge