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feat(data/equiv/basic): add
equiv.set.compl
(#4630)
Given an equivalence between two sets `e₀ : s ≃ t`, the set of `e : α ≃ β` that agree with `e₀` on `s` is equivalent to `sᶜ ≃ tᶜ`. Also add a bunch of lemmas to `data/set/function`; some of them are used in the definition of `equiv.set.compl`. Co-authored-by: Chris Hughes <chrishughes24@gmail.com>
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