[Merged by Bors] - chore(algebra/ordered_group): move monoid stuff to ordered_monoid.lean #5066
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Replace one 2000 line file with two 1000 line files: ordered group stuff in one, and ordered monoid stuff in the other.
I want to add
linear_ordered_comm_monoid_with_zero
andlinear_ordered_comm_group
but couldn't face editing a file which was already 2000 lines long (algebra/ordered_group.lean). This PR (hopefully) does nothing more than put the existing monoid stuff into one file and the group stuff into another.