Add macros to identify L0 headers

[jandres742]

similar to CL_TARGET_OPENCL_VERSION

https://github.com/KhronosGroup/OpenCL-Headers/blob/main/CL/cl_version.h

[yoon0805]

Currently the only solution that L0 driver will be able to retrieve L0 loader version is via a simple program and use zeInit() and then calling zelLoaderGetVersions().

If we know what version that L0 driver gets compiled with the L0 spec header, the process could be much simpler.

[bmyates]

The spec headers have ZE_API_VERSION_CURRENT macro

[wdamon-intel]

Technically, ZE_API_VERSION_CURRENT is not a #define or a macro but part of the enum ze_api_version_t, and it lives in ze_api.h.

[lisanna-dettwyler]

#306