feat/chore: move definition of surfaces#141
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Spelling: handle, not handel. Affects the def name in `LeanEval/Topology/Prelude.lean` and the `id` + `holes` entries for `complHandlebodyHomeomorph` in the manifest. The other three new problems already spell "Handlebody" correctly.
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I have a definition of mapping class groups and would like to state some facts about MCGs of surfaces, so I'm moving definition of surfaces to a Prelude file. Also:
changes their namespace from ClassificationOfSurfaces to Surface.
removes the redundant IsManifold condition from classification of surfaces statement.
defines 3D handlebodies and add a problem to show the boundary of a genus g handlebody is a genus g surface. I plan to use these handlebodies to state Heegaard splittings.
defines action of continuous maps on singular homology as a homomorphism. Will be used to define orientation-preserving/reversing maps.