feat(algebra): the forgetful functor Module ℤ ⥤ Ab is an equivalence (#2130)
* feat(algebra): the forgetful functor Module ℤ ⥤ Ab is an equivalence
* oops, forgot to add file
* missing conversion
* not there yet
* fixes
* doc-strings, and remove more instances
* various
* oops
* revert
* Delete multilinear.olean.lock
* revert
* move instances
* Remove note about a bug fixed in #1586.
* whitespace
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>