Support streaming kernel arguments and streaming kernel control

[pcolberg]

This introduces a backwards-incompatible change in the HAL MMD API between runtime and simulator. The first commit defines the streaming kernel argument interface, while subsequent commits will contain the implementation.

@anandhv @bsyrowik @zibaiwan @sherry-yuan @intel-jisheng1

[pcolberg]

@anandhv I have modified acl.h in commit 1892082 not to use C++17, for backwards compatibility with the LLVM-based FPGA compiler which requires C++11 and will transition to C++17 in LLVM 16.

[pcolberg]

Klocwork is failing to correctly analyze use of std::optional:

fpga-runtime-for-opencl/src/acl_kernel_if.cpp

Lines 1349 to 1355 in 35adcb6

	// read the printf buffer size from the kernel cra, just after the
	// kernel arguments
	if (kern->accel_num_printfs[accel_id] > 0) {
	printf_size = 0;
	acl_kernel_cra_read(kern, accel_id, KERNEL_OFFSET_PRINTF_BUFFER_SIZE,
	&*printf_size);
	assert(*printf_size <= ACL_PRINTF_BUFFER_TOTAL_SIZE);

174 (Local) /__w/fpga-runtime-for-opencl/fpga-runtime-for-opencl/src/acl_kernel_if.cpp:1355 NPD.GEN.MUST (1:Critical) Analyze
Null pointer 'printf_size' that comes from line 1352 will be dereferenced at line 1355.
  * acl_kernel_if.cpp:1352: 'printf_size' has been assigned a NULL value.
  * acl_kernel_if.cpp:1355: 'printf_size' is explicitly dereferenced.

This may be worked around using, e.g., std::optional::emplace().

fpga-runtime-for-opencl/src/acl_kernel_if.cpp

Lines 1349 to 1355 in 72c1b68

	// read the printf buffer size from the kernel cra, just after the
	// kernel arguments
	if (kern->accel_num_printfs[accel_id] > 0) {
	printf_size.emplace(0);
	acl_kernel_cra_read(kern, accel_id, KERNEL_OFFSET_PRINTF_BUFFER_SIZE,
	&*printf_size);
	assert(*printf_size <= ACL_PRINTF_BUFFER_TOTAL_SIZE);

[pcolberg]

@anandhv Please see the slightly revised HAL MMD streaming kernel API.

[pcolberg]

This PR still requires a slight modification to revert the auto-discovery string format back to the initial design, after which it will be ready for integration testing.

[zibaiwan]

LGTM!