Matrex.dot_and_apply/3

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Computes dot product of two matrices, then applies math function to each element
of the resulting matrix.

## Example

    iex> Matrex.new([[1, 2, 3], [4, 5, 6]]) |>
    ...> Matrex.dot_and_apply(Matrex.new([[1, 2], [3, 4], [5, 6]]), :sqrt)
    #Matrex[2×2]
    ┌                 ┐
    │ 4.69042  5.2915 │
    │     7.0     8.0 │
    └                 ┘
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