Matrex.forward_substitute/2

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Matrix forward substitution. NIF, via naive C implementation.

The first matrix must be square while the
number of columns of the first matrix must
equal the number of rows of the second.

Raises `ErlangError` if matrices' sizes do not match.

## Example

    iex> Matrex.forward_substitute(
    ...>   Matrex.new([[3, 4], [4, 8]]) |> Matrex.cholesky(),
    ...>   Matrex.new([[1],[2]]))
    #Matrex[2×1]
    ┌         ┐
    │ 0.57735 │
    │ 0.40825 │
    └         ┘
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