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feat(ring_theory/fractional_ideal): pushforward of fractional ideals (#…
…2984) Extend `submodule.map` to fractional ideals by showing that the pushforward is also fractional. For this, we need a slightly tweaked definition of fractional ideal: if we localize `R` at the submonoid `S`, the old definition required a nonzero `x : R` such that `xI ≤ R`, and the new definition requires `x ∈ S` instead. In the most common case, `S = non_zero_divisors R`, the results are exactly the same, and all operations are still the same. A practical use of these pushforwards is included: `canonical_equiv` states fractional ideals don't depend on choice of localization map. Co-authored-by: Vierkantor <Vierkantor@users.noreply.github.com>
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