feat(data/set/intervals/image_preimage): new file (#2958)
* Create a file for lemmas like
`(λ x, x + a) '' Icc b c = Icc (b + a) (b + c)`.
* Prove lemmas about images and preimages of all intervals under
`x ↦ x ± a`, `x ↦ a ± x`, and `x ↦ -x`.
* Move lemmas about multiplication from `basic`.
