Make `Mat[x]::new()` functions public

[LegNeato]

The Mat[x]::new() functions are not public but they are for Vecs. Is there a reason we must use from_cols or the fields directly instead of calling new()? For reference, here is the private function for Mat3:

    #[allow(clippy::too_many_arguments)]
    #[inline(always)]
    #[must_use]
    const fn new(
        m00: f32,
        m01: f32,
        m02: f32,
        m10: f32,
        m11: f32,
        m12: f32,
        m20: f32,
        m21: f32,
        m22: f32,
    ) -> Self {
        Self {
            x_axis: Vec3::new(m00, m01, m02),
            y_axis: Vec3::new(m10, m11, m12),
            z_axis: Vec3::new(m20, m21, m22),
        }
    }

I put up a PR in case this is an oversight rather than an explicit choice.

[bitshifter]

The purpose of from_cols is that it explicitly describes that the input data should be column vectors as opposed to row vectors, this is why raw new is not exposed as is. If I were to expose a new method that takes values in column order I'd suggest calling it from_cols_values which would use similar naming to existing methods.