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feat(Algebra/DirectSum): equivalence between direct sum indexed by ι₁ and double sum indexed by ι₂ and fibres of f : ι₁ → ι₂#39607

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feat(Algebra/DirectSum): equivalence between direct sum indexed by ι₁ and double sum indexed by ι₂ and fibres of f : ι₁ → ι₂#39607
TentativeConvert wants to merge 30 commits into
leanprover-community:masterfrom
TentativeConvert:sigma-fiber-equiv

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