[SYCL] Include `sycl/ext/intel/experimental/grf_size_properties.hpp` in `sycl/sycl.hpp` (#21721)
This PR includes `sycl/ext/intel/experimental/grf_size_properties.hpp`
in `sycl/sycl.hpp`.
So we can build code using this extension by just including
`sycl/sycl.hpp`.
Extension spec:
https://github.com/intel/llvm/blob/d5927713cd99226a7114f8857691c12f1e84e436/sycl/doc/extensions/experimental/sycl_ext_intel_grf_size.asciidoc
Tracker: CMPLRLLVM-73615