Refactor OpenCL integration using maintained OpenCL C++ interface

[jcfr]

• Add OpenCL-(CLHPP|Headers|ICD-Loader} external projects
• Refactor Autoscoper OpenCL classes to use cl::* object

References

• https://github.com/InsightSoftwareConsortium/ITKVkFFTBackend
• Commit for disabling all OpenCL code paths except the Sobel filter.

Notes:

• on macOS, we will likely have to integrate OpenCL-SDK likely because (?) the system OpenCL header available on macOS only support an older OpenCL version.

[jcfr]

They may want to disable this and only rely on error checking (at least while we are refactoring the Autoscoper API)

[NicerNewerCar]

Currently the C++ conversion is crashing at OpenCL.cppL741 (upon creation of the context) with the error -32 - CL_INVALID_PLATFORM

Here is a quick comparison of the same platform from the C/C++ APIs:

Field	C	C++
Name	NVIDIA RTX A2000 Laptop GPU	NVIDIA RTX A2000 Laptop GPU
Type	GPU	GPU
Compute Cores	20	20
Core Freq.	1824 Mhz	1824 Mhz
Vendor	NVIDIA Corporation	NIVIDIA Corporation
Vendor ID	4318	4318
Version	OpenCL 3.0 CUDA	OpenCL 3.0 CUDA
Driver Version	527.27	527.27
Available	Yes	Yes
Max Items	(1024,1024,64)	(1024,1024,64)
Max Group	1024	1024
Max Constant	65536 kB	65536 kB
Max Constants	9	9
Local Mem	48 kB	48 kB
Global Mem	65536 kB	65536 kB
Global Cache	573440 B	573440 B
Image Support	1	1
Max 2D Image	(32768,32768)	(1024,1024)
Max 3D Image	(16384,16384,16384)	(1024,1024,64)
Extensions	cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_khr_gl_event cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_nv_kernel_attribute cl_khr_device_uuid cl_khr_pci_bus_info cl_khr_external_semaphore cl_khr_external_memory cl_khr_external_semaphore_win32 cl_khr_external_memory_win32	cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_fp64 cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_d3d10_sharing cl_khr_d3d10_sharing cl_nv_d3d11_sharing cl_nv_copy_opts cl_khr_gl_event cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_nv_kernel_attribute cl_khr_device_uuid cl_khr_pci_bus_info cl_khr_external_semaphore cl_khr_external_memory cl_khr_external_semaphore_win32 cl_khr_external_memory_win32