[NATIVECPU] urEnqueueUSMMemcpy2D implementation added

[uwedolinsky]

This makes at least the following e2e tests pass on NativeCPU:

  SYCL :: USM/memops2d/copy2d_device_to_device.cpp
  SYCL :: USM/memops2d/copy2d_device_to_dhost.cpp
  SYCL :: USM/memops2d/copy2d_device_to_host.cpp
  SYCL :: USM/memops2d/copy2d_device_to_shared.cpp
  SYCL :: USM/memops2d/copy2d_dhost_to_device.cpp
  SYCL :: USM/memops2d/copy2d_dhost_to_dhost.cpp
  SYCL :: USM/memops2d/copy2d_dhost_to_host.cpp
  SYCL :: USM/memops2d/copy2d_dhost_to_shared.cpp
  SYCL :: USM/memops2d/copy2d_host_to_device.cpp
  SYCL :: USM/memops2d/copy2d_host_to_dhost.cpp
  SYCL :: USM/memops2d/copy2d_host_to_host.cpp
  SYCL :: USM/memops2d/copy2d_host_to_shared.cpp
  SYCL :: USM/memops2d/copy2d_shared_to_device.cpp
  SYCL :: USM/memops2d/copy2d_shared_to_dhost.cpp
  SYCL :: USM/memops2d/copy2d_shared_to_host.cpp
  SYCL :: USM/memops2d/copy2d_shared_to_shared.cpp
  SYCL :: USM/memops2d/fill2d.cpp
  SYCL :: USM/memops2d/memcpy2d_device_to_device.cpp
  SYCL :: USM/memops2d/memcpy2d_device_to_dhost.cpp
  SYCL :: USM/memops2d/memcpy2d_device_to_host.cpp
  SYCL :: USM/memops2d/memcpy2d_device_to_shared.cpp
  SYCL :: USM/memops2d/memcpy2d_dhost_to_device.cpp
  SYCL :: USM/memops2d/memcpy2d_dhost_to_dhost.cpp
  SYCL :: USM/memops2d/memcpy2d_dhost_to_host.cpp
  SYCL :: USM/memops2d/memcpy2d_dhost_to_shared.cpp
  SYCL :: USM/memops2d/memcpy2d_host_to_device.cpp
  SYCL :: USM/memops2d/memcpy2d_host_to_dhost.cpp
  SYCL :: USM/memops2d/memcpy2d_host_to_host.cpp
  SYCL :: USM/memops2d/memcpy2d_host_to_shared.cpp
  SYCL :: USM/memops2d/memcpy2d_shared_to_device.cpp
  SYCL :: USM/memops2d/memcpy2d_shared_to_dhost.cpp
  SYCL :: USM/memops2d/memcpy2d_shared_to_host.cpp
  SYCL :: USM/memops2d/memcpy2d_shared_to_shared.cpp
  SYCL :: USM/memops2d/memset2d.cpp

[uwedolinsky]

@intel/llvm-gatekeepers This looks ready to merge. Thanks!