Add SparseMatricesCSR.jl Ext

[Abdelrahman912]

Add support to CPU CSR matrices, e.g., ROCSparseMatrixCSR(::SparseMatrixCSR)

[luraess]

Thanks for the contribution! The structure closely mirrors what CUDA.jl does in lib/cusparse/ext/SparseMatricesCSRExt.jl.

One thing to consider (unless I am wrong): SparseMatricesCSR.SparseMatrixCSR{Bi,Tv,Ti} has a type parameter Bi for the index base (0 or 1). The CPU→GPU constructors currently use Mat.rowptr/Mat.colval directly without checking Bi, which would silently produce incorrect index arrays for a 0-based SparseMatrixCSR{0}; ROCSPARSE expects 1-based pointers in the Julia wrappers (matching the SparseMatrixCSR{1} used in the GPU→CPU direction). Restricting the dispatch to {1} would turn this into a clear error instead:

ROCSparseMatrixCSR{T}(Mat::SparseMatrixCSR{1}) where {T} = ...

Note that CUDA.jl has the same gap, but this could be also fixed there if needbe.