feat(physics): add delta param to move_and_slide
This adds an optional delta parameter to KinematicBody::move_and_slide, KinematicBody::move_and_slide_with_snap, KinematicBody2D::move_and_slide, and KinematicBody2D::move_and_slide_with_snap that can be used to override the delta value used in physics calculations.
fixes #24322