First steps to enable SYCL backend in Python Interface

[sommerlukas]

First implementation steps towards supporting the SYCL backend in the CUTLASS Python Interface.

The main additions from this PR are:

• Generating a suitable GEMM template and arguments for the CUTLASS 3.x API and Intel PVC as target.
• Calling DPC++ instead of nvcc to compile device and host code.
• Using the DPCTL library to transfer data and launch the kernel via SYCL.

The support so far focuses on a simple GEMM, epilogues (e.g, with visitor) are not yet supported.

Compilation is currently only possible with development versions of DPC++, the -fsycl-rtc-mode flag that was added to support CUTLASS nested parameter classes in free-function kernels as part of this work is not yet available in releases.

The activation of the SYCL backend via environment variable is a temporary solution, a follow-up will look into a cleaner solution.

[aacostadiaz]

Look good, thanks!!!

I left some questions but I think they will be more relevant for follow up PRs.

[FMarno]

Looks fine to me. Hard to see individual issues, but I also don't really have a knowledge of the whole system.