additional sources are necessary to use gdb-oneapi
the same is true for the other tools (advisor, inspector, vtune...) but since they are useless there is no point in sourcing them as well

The application is compiled once for the CPU(s) and once for the Intel GPU(s).
The flags for AOT compilation have been added and icpx is used as the default compiler for the SYCL backend.
The linking step is performed as well with icpx when the SYCL backend is enabled.

commit 819974ddc5b2eb4b33e709bd317701793cdb7d15
Author: Jan Stephan <[email protected]>
Date:   Thu Aug 3 14:20:59 2023 +0200

    Always use std::size_t for CUDA pitch calculations

Changed the order to make the ONEAPI compiler happy

For the other backends it is mapped to ALPAKA_STATIC_ACC_MEM_CONSTANT, but global variables are not supported yet in the SYCL backend.
However, in this case a `constexpr` is enough to obtain the same result

- added the allocator policy: Caching or Synchronous
- added allocCachedBuf: TODO implement pitch in SYCL
- fixed cout because SYCL events in alpaka are not shared pointers
- do not cache SYCL events
- Changed size of CountersOnly to 1 because SYCL kernels do not support zero-lenght arrays
- implemented HostOnlyTask using `alpaka/core/CallbackThread`
- adapt `prefixScan` and `radixSort` to SYCL: work around the function pointer not supported in SYCl kernels
- implemented the work division
- add the `--syclcpu` and `--syclgpu` options for the backends

Math functions are defined in the `namespace math` and are taken from the `sycl namespace` for the SYCL backend, from the global namespace for the CUDA and HIP backends and from the `std namespace` in every other case

added the ifdef for SYCL

Add trait to set the warp size to 32 for the kernels that requires it.
Implemented in alpaka only for the SYCL backend at the moment, does nothing for the other backends

There is a bug with `any_of_group` / `all_of_group` in the OpenCL runtime that can be worked around setting the sub-group size equal to the block size.
The bug has been solved in the latest runtimes, but the application hangs with these..