Add PcloudAmbienceStencil, LG1PcloudAmbienceStencil

These two classes represent our first foray into stencil
construction. One of them standardizes PcloudAmbience stencils
across all stimbuffs, and the other specifies the internal
memory constraints and requirements for a LivoxGen1 device's
stencils.

stimBuffApis/livoxGen1/pcloudStimulusProducer.cpp

@@ -9,7 +9,9 @@
 #include <asynchronousLoop.h>
 #include <user/stimulusFrame.h>
 #include <user/frameAssemblyDesc.h>
+#include <user/pcloudAmbienceStencil.h>
 #include <livoxProto1/device.h>
+#include "livoxGen1.h"
 #include "pcloudStimulusProducer.h"
 
 namespace smo {
@@ -56,7 +58,7 @@ static StagingBuffer::IOEngineConstraints openClAmbienceInputConstraints(
 	// slotStartAlignmentByteVal (page alignment)
 	static_cast<size_t>(sysconf(_SC_PAGE_SIZE)),
 	// slotPadToNBytes: This is dynamically calculated based on the return mode.
-	sizeof(uint32_t),
+	sizeof(PcloudAmbienceStencil::PcloudAmbienceStimulusValue),
 	// frameStartAlignmentByteVal (page alignment)
 	static_cast<size_t>(sysconf(_SC_PAGE_SIZE)),
 	// framePadToNBytes (pointer size)