[AsyncAlloc][UR][Exp] Initial API for async alloc entry points (#17117)

Introduce unimplemented UR API for the creation and use of memory pools
with enqueued allocs/frees.

Currently, this only supports device allocated memory pools.

This extension is experimental and may change drastically between
revisions.

---------

Co-authored-by: Hugh Delaney <hugh.delaney@codeplay.com>

Author: Seanst98

unified-runtime/include/ur_api.h

@@ -132,9 +132,33 @@ _UR_API(urEnqueueReadHostPipe)
 _UR_API(urEnqueueWriteHostPipe)
 _UR_API(urEnqueueEventsWaitWithBarrierExt)
 _UR_API(urEnqueueKernelLaunchCustomExp)
+_UR_API(urEnqueueUSMDeviceAllocExp)
+_UR_API(urEnqueueUSMSharedAllocExp)
+_UR_API(urEnqueueUSMHostAllocExp)
+_UR_API(urEnqueueUSMFreeExp)
 _UR_API(urEnqueueCooperativeKernelLaunchExp)
 _UR_API(urEnqueueTimestampRecordingExp)
 _UR_API(urEnqueueNativeCommandExp)
+_UR_API(urUSMHostAlloc)
+_UR_API(urUSMDeviceAlloc)
+_UR_API(urUSMSharedAlloc)
+_UR_API(urUSMFree)
+_UR_API(urUSMGetMemAllocInfo)
+_UR_API(urUSMPoolCreate)
+_UR_API(urUSMPoolRetain)
+_UR_API(urUSMPoolRelease)
+_UR_API(urUSMPoolGetInfo)
+_UR_API(urUSMPoolCreateExp)
+_UR_API(urUSMPoolDestroyExp)
+_UR_API(urUSMPoolSetThresholdExp)
+_UR_API(urUSMPoolGetDefaultDevicePoolExp)
+_UR_API(urUSMPoolGetInfoExp)
+_UR_API(urUSMPoolSetDevicePoolExp)
+_UR_API(urUSMPoolGetDevicePoolExp)
+_UR_API(urUSMPoolTrimToExp)
+_UR_API(urUSMPitchedAllocExp)
+_UR_API(urUSMImportExp)
+_UR_API(urUSMReleaseExp)
 _UR_API(urBindlessImagesUnsampledImageHandleDestroyExp)
 _UR_API(urBindlessImagesSampledImageHandleDestroyExp)
 _UR_API(urBindlessImagesImageAllocateExp)
@@ -153,18 +177,6 @@ _UR_API(urBindlessImagesImportExternalSemaphoreExp)
 _UR_API(urBindlessImagesReleaseExternalSemaphoreExp)
 _UR_API(urBindlessImagesWaitExternalSemaphoreExp)
 _UR_API(urBindlessImagesSignalExternalSemaphoreExp)
-_UR_API(urUSMHostAlloc)
-_UR_API(urUSMDeviceAlloc)
-_UR_API(urUSMSharedAlloc)
-_UR_API(urUSMFree)
-_UR_API(urUSMGetMemAllocInfo)
-_UR_API(urUSMPoolCreate)
-_UR_API(urUSMPoolRetain)
-_UR_API(urUSMPoolRelease)
-_UR_API(urUSMPoolGetInfo)
-_UR_API(urUSMPitchedAllocExp)
-_UR_API(urUSMImportExp)
-_UR_API(urUSMReleaseExp)
 _UR_API(urCommandBufferCreateExp)
 _UR_API(urCommandBufferRetainExp)
 _UR_API(urCommandBufferReleaseExp)