mathlib3

47b51515 - refactor(*): supremum of refactoring PRs #17405 #17418 #17419 #17420 #17421 #17422 #17423 #17427 #17430 (#17424)

refactor(*): supremum of refactoring PRs #17405 #17418 #17419 #17420 #17421 #17422 #17423 #17427 #17430 (#17424) Co-authored-by: Yury G. Kudryashov <urkud@urkud.name> Co-authored-by: Scott Morrison <scott.morrison@gmail.com> Co-authored-by: Yaël Dillies <yael.dillies@gmail.com>