[UR][L0] Use direct function pointers for image extensions on L0 API >= 1.15 (#21642)
Starting with Level Zero API version 1.15, zeImageGetDeviceOffsetExp and
zeMemGetPitchFor2dImage are available as direct symbols rather than
requiring dynamic lookup via zeDriverGetExtensionFunctionAddress. Use
the
direct function pointers when API >= 1.15 and fall back to the dynamic
lookup for older versions.
Signed-off-by: Lukasz Dorau <lukasz.dorau@intel.com>