text: Title: Add/move `_differentiable_clipping`, ` _differentiable_polynomial_floor` and ` _differentiable_polynomial_rounding` to our utilities functions
  Body:               for a further pr, i think having `_differentiable_clipping`, ` _differentiable_polynomial_floor` and ` _differentiable_polynomial_rounding` into our utilities can be usefully :)
  
  _Originally posted by @johnnv1 in https://github.com/kornia/kornia/pull/2748#discussion_r1464089248_
              