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feat(Algebra/Ring/Ext): prove extensionality lemmas for Ring and simi…
…lar typeclasses (#9511) Add a file `Algebra/Ring/Ext`, proving `ext` lemmas for all of the ring-like classes (for example, anything from `NonUnitalNonAssocSemiring` to `CommRing`), stating that two instances of such a class are equal if they define the same addition and multiplication operations. Also prove `ext_iff` variants for each class, and injectivity lemmas for projections from classes to parent classes.
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