feat(hott/cubical): add cubes which are degenerate in one dimension
feat(hott/cubical): add cubes which are degenerate in one dimension

soonhokong/lean,fpvandoorn/lean,javra/lean,UlrikBuchholtz/lean,johoelzl/lean,fpvandoorn/lean2,UlrikBuchholtz/lean,leodemoura/lean,leodemoura/lean,dselsam/lean,Kha/lean,Kha/lean,levnach/lean,fgdorais/lean,Kha/lean,dselsam/lean,leanprover-community/lean,johoelzl/lean,javra/lean,leanprover/lean,rlewis1988/lean,avigad/lean,digama0/lean,johoelzl/lean,soonhokong/lean-windows,fpvandoorn/lean2,fpvandoorn/lean,fgdorais/lean,avigad/lean,leodemoura/lean,rlewis1988/lean,javra/lean,dselsam/lean,fpvandoorn/lean,johoelzl/lean,digama0/lean,dselsam/lean,rlewis1988/lean,Kha/lean,fgdorais/lean,soonhokong/lean,digama0/lean,soonhokong/lean,dselsam/lean,fgdorais/lean,johoelzl/lean,UlrikBuchholtz/lean,leanprover-community/lean,dselsam/lean,fpvandoorn/lean,leanprover/lean,leodemoura/lean,fpvandoorn/lean2,fpvandoorn/lean2,UlrikBuchholtz/lean,fgdorais/lean,avigad/lean,soonhokong/lean-osx,digama0/lean,soonhokong/lean,leanprover/lean,rlewis1988/lean,levnach/lean,javra/lean,johoelzl/lean,avigad/lean,soonhokong/lean,leanprover-community/lean,leanprover-community/lean,soonhokong/lean-windows,soonhokong/lean-osx,fpvandoorn/lean,leanprover/lean,rlewis1988/lean,rlewis1988/lean,leanprover-community/lean,Kha/lean,soonhokong/lean-osx,leanprover/lean,soonhokong/lean-windows,Kha/lean,soonhokong/lean-osx,fgdorais/lean,leodemoura/lean,levnach/lean,digama0/lean,avigad/lean,UlrikBuchholtz/lean,leanprover-community/lean,levnach/lean,levnach/lean,soonhokong/lean-osx,soonhokong/lean-windows,fpvandoorn/lean2,soonhokong/lean-windows,javra/lean,avigad/lean,leanprover/lean,digama0/lean,leodemoura/lean,fpvandoorn/lean