feat(data/monoid_algebra): Allow R ≠ k in semimodule R (monoid_algebra k G) (#4365)
feat(data/monoid_algebra): Allow R ≠ k in semimodule R (monoid_algebra k G) (#4365)

Also does the same for the additive version `semimodule R (add_monoid_algebra k G)`.





leanprover-community/mathlib,leanprover-community/mathlib