[SYCL] Implement sycl_khr_includes
extension
#20339
Draft
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The specification can be found in KhronosGroup/SYCL-Docs#814
The implementation is a non-functional change for the existing codebase, but definitions of macro documented by the SYCL 2020 specifications were moved around a little bit to provide them all through the new
sycl/khr/version.hpp
.New headers are always present and their content is always available. However, we do not define
SYCL_KHR_INCLUDES
macro yet because the extension is still on review. That indicates that it is not formally supported by the implementation.