[EXP][Command-Buffer] Add kernel command update

[EwanC]

This change introduces a new API that allows the kernel commands of a command-buffer to be updated
with a new configuration. For example, modified arguments or ND-Range.

API

The new API is defined in the following files and then source generated using scripts, so reviewers should look at:

• scripts/core/EXP-COMMAND-BUFFER.rst
• scripts/core/exp-command-buffer.yml

See cl_khr_command_buffer_mutable_dispatch as prior art. The differences between the proposed API and the above are:

• Only the append kernel entry-point returns a command handle. I imagine this will be changed in future to enable other commands to do update.
• USM, buffer, and scalar arguments can be updated, there is not equivalent update struct for urKernelSetArgLocal or urKernelSetArgSampler
• There is no granularity of optional support for update, an implementer must either implement all the ways to update a kernel configuration, or none of them.
• Command-handles are reference counted in UR, and extend the lifetime of the parent command-buffer.

Adapters

The CUDA adapter is the only adapter that currently implements this new feature, other adapters don't report support. This is because CUDA is already an adapter supported by UR command-buffers, and the CUDA API for updating nodes already exists as a non-optional feature.

Reviewers should review the changes in source/adapters/cuda/ to evaluate this,

CTS

CTS tests are written to verify implementation, as there is not yet a DPC++ feature with testing to stress the code path (see reble/llvm#340 for how that feature could look).

A new test directory has been created to test the command-buffer experimental feature, test/conformance/exp_command_buffer, which contains tests to stress using the feature defined by this extension so that it has code coverage. Reviewers should look at the new tests added here, and new device kernels in test/conformance/device_code to evaluate these changes.

[fabiomestre]

I have updated the target branch of this PR from the adapters branch to the main branch.
Development in UR is moving back to main. The adapters branch will soon be deleted.

[codecov-commenter]

Codecov Report

Attention: 1372 lines in your changes are missing coverage. Please review.

Comparison is base (5e548c5) 15.33% compared to head (fbdaf72) 14.82%.

Files	Patch %	Lines
include/ur_print.hpp	0.00%	349 Missing ⚠️
...e/exp_command_buffer/buffer_fill_kernel_update.cpp	0.00%	140 Missing ⚠️
...ance/exp_command_buffer/usm_fill_kernel_update.cpp	0.00%	140 Missing ⚠️
.../conformance/exp_command_buffer/ndrange_update.cpp	0.00%	101 Missing ⚠️
test/conformance/exp_command_buffer/fixtures.h	0.00%	69 Missing ⚠️
.../exp_command_buffer/buffer_saxpy_kernel_update.cpp	0.00%	68 Missing ⚠️
source/loader/ur_ldrddi.cpp	7.04%	66 Missing ⚠️
...nce/exp_command_buffer/usm_saxpy_kernel_update.cpp	0.00%	64 Missing ⚠️
source/loader/layers/validation/ur_valddi.cpp	13.69%	63 Missing ⚠️
.../conformance/exp_command_buffer/invalid_update.cpp	0.00%	53 Missing ⚠️
... and 8 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1089      +/-   ##
==========================================
- Coverage   15.33%   14.82%   -0.52%     
==========================================
  Files         241      250       +9     
  Lines       34821    36220    +1399     
  Branches     3989     4094     +105     
==========================================
+ Hits         5340     5369      +29     
- Misses      29430    30800    +1370     
  Partials       51       51              

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