Function add
pub fn add<I, E, LhsE, RhsE>(
lhs: SparseColMatRef<'_, I, LhsE>,
rhs: SparseColMatRef<'_, I, RhsE>,
) -> Result<SparseColMat<I, E>, FaerError>
pub fn add<I, E, LhsE, RhsE>(
lhs: SparseColMatRef<'_, I, LhsE>,
rhs: SparseColMatRef<'_, I, RhsE>,
) -> Result<SparseColMat<I, E>, FaerError>