mathlib

a7ec6336 - chore(algebra/*): add missing lemmas about `copy` on subobjects (#9624)

chore(algebra/*): add missing lemmas about `copy` on subobjects (#9624) This adds `coe_copy` and `copy_eq` to `sub{mul_action,group,ring,semiring,field,module,algebra,lie_module}`, to match the lemmas already present on `submonoid`.