feat(ring_theory/polynomial): mv_polynomial.integral_domain (#2021)
* feat(ring_theory/polynomial): mv_polynomial.integral_domain
* Add docstrings
* Add docstrings
* Fix import
* Fix build
* Please linter, please
* Update src/algebra/ring.lean
* Clean up code, process comments
* Update src/data/equiv/fin.lean
* Update src/data/equiv/fin.lean
* Update src/data/equiv/fin.lean
* Update src/ring_theory/polynomial.lean
Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr>
Co-authored-by: Scott Morrison <scott@tqft.net>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>