[Merged by Bors] - feat(data/matrix/reflection): add mul_vec and vec_mul
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eric-wieser
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This follows the pattern already established by `mul`. The motivation was an example on Zulip which wanted to compute the product of ```lean def M := !![(2:ℂ), 0, 0; 0, 1, 0; 0, 0, 1] def v := ![(0:ℂ), 0, 1] ``` As before, the meta code that makes this pleasant to use is absent, but I will add it along with the rest of the meta code in #15738.
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mul_vec and vec_mulmul_vec and vec_mul
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This follows the pattern already established by
mul.The motivation was an example on Zulip which wanted to compute the product of
As before, the meta code that makes this pleasant to use is absent, but I will add it along with the rest of the meta code in #15738.