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

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. The only implemented adapter
is CUDA.

See
[cl_khr_command_buffer_mutable_dispatch](https://registry.khronos.org/OpenCL/specs/3.0-unified/html/OpenCL_Ext.html#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.
* Only USM and buffer arguments can be updated, there is not equivalent
  update struct for `urKernelSetArgLocal`, `urKernelSetArgValue`, 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.

include/ur_ddi.h

@@ -1853,7 +1853,8 @@ typedef ur_result_t(UR_APICALL *ur_pfnCommandBufferAppendKernelLaunchExp_t)(
     const size_t *,
     uint32_t,
     const ur_exp_command_buffer_sync_point_t *,
-    ur_exp_command_buffer_sync_point_t *);
+    ur_exp_command_buffer_sync_point_t *,
+    ur_exp_command_buffer_command_handle_t *);
 
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Function-pointer for urCommandBufferAppendUSMMemcpyExp
@@ -2010,6 +2011,12 @@ typedef ur_result_t(UR_APICALL *ur_pfnCommandBufferEnqueueExp_t)(
     const ur_event_handle_t *,
     ur_event_handle_t *);
 
+///////////////////////////////////////////////////////////////////////////////
+/// @brief Function-pointer for urCommandBufferUpdateKernelLaunchExp
+typedef ur_result_t(UR_APICALL *ur_pfnCommandBufferUpdateKernelLaunchExp_t)(
+    ur_exp_command_buffer_command_handle_t,
+    const ur_exp_command_buffer_update_kernel_launch_desc_t *);
+
 ///////////////////////////////////////////////////////////////////////////////
 /// @brief Table of CommandBufferExp functions pointers
 typedef struct ur_command_buffer_exp_dditable_t {
@@ -2030,6 +2037,7 @@ typedef struct ur_command_buffer_exp_dditable_t {
     ur_pfnCommandBufferAppendUSMPrefetchExp_t pfnAppendUSMPrefetchExp;
     ur_pfnCommandBufferAppendUSMAdviseExp_t pfnAppendUSMAdviseExp;
     ur_pfnCommandBufferEnqueueExp_t pfnEnqueueExp;
+    ur_pfnCommandBufferUpdateKernelLaunchExp_t pfnUpdateKernelLaunchExp;
 } ur_command_buffer_exp_dditable_t;
 
 ///////////////////////////////////////////////////////////////////////////////