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feat(NumberTheory.NumberField.CanonicalEmbedding): add exists_ne_zero…
…_mem_ringOfIntegers_lt (#5650) This PR proves the following result: ```lean theorem exists_ne_zero_mem_ringOfIntegers_lt (h : minkowski_bound K < volume (convex_body_lt K f)) : ∃ (a : 𝓞 K), a ≠ 0 ∧ ∀ w : InfinitePlace K, w a < f w ``` where `f : InfinitePlace K → ℝ≥0` and `convex_body_lt K f` is the set of points `x` such that `‖x w‖ < f w` for all infinite places `w`. This is a key result in the proof of Dirichlet's unit theorem #5960
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