[Merged by Bors] - feat(order/category/Lattice): The category of lattices #11968
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YaelDillies
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As a TODO, you could make the functor Lattice => BoundedLattice which adds bounds by with_top (with_bot X) and show its adjunction relations. Please don't include that in this PR though.
I want to check with @Vierkantor that the new instances in order/hom/lattice make sense, otherwise lgtm!
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Define `Lattice`, the category of lattices with lattice homs.
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Define
Lattice, the category of lattices with lattice homs.