[SYCL] Add sycl wrappers for fp conversions. (#9431)
This PR adds C++ wrappers in intel math header for type conversion
functions provided in SYCL libdevice.
The function names align with CUDA correspondence but we don't use "__"
prefix in function name.
For example, CUDA __double2float_ru maps to
sycl::ext::intel::math::double2float_ru.
---------
Signed-off-by: jinge90 <ge.jin@intel.com>
