More support for automatically removing `.attach`, for `Array` and `Option`.
List.attach
Array.attach
Source material: 555ec79bc6/Batteries/Data/List/Init/Attach.lean 555ec79bc6/Batteries/Data/Array/Basic.lean (L133-L148) Closes RFC #4414
555ec79bc6/Batteries/Data/List/Init/Attach.lean
555ec79bc6/Batteries/Data/Array/Basic.lean (L133-L148)