livoxGen1: Add StimBuffs to PcloudStimProd

* PcloudStimulusProducer now has member sh_ptr<StimulusBuffer>s.
* StimulusProducer now has a vector<sh_ptr<StimulusBuffer>s.

Created new stimbuff-type-specific
Pcloud[Xyz|I|Ambience]StimulusBuffer classes for representing each
stim feature exposed by livoxGen1's PcloudStimulusProducer.

stimBuffApis/livoxGen1/pcloudXyzStimulusBuffer.h

@@ -0,0 +1,41 @@
+#ifndef _LIVOX_GEN1_PCLOUD_XYZ_STIMULUS_BUFFER_H
+#define _LIVOX_GEN1_PCLOUD_XYZ_STIMULUS_BUFFER_H
+
+#include <memory>
+#include <user/stimulusBuffer.h>
+
+namespace smo {
+namespace stim_buff {
+
+// Forward declaration
+class StimulusProducer;
+
+/**
+ * PcloudXyzStimulusBuffer is a specialized StimulusBuffer for XYZ point cloud data.
+ */
+class PcloudXyzStimulusBuffer
+:	public StimulusBuffer
+{
+public:
+	explicit PcloudXyzStimulusBuffer(
+		std::shared_ptr<StimulusProducer>& producer,
+		const std::shared_ptr<device::DeviceAttachmentSpec>& deviceAttachmentSpec,
+		int histbuffMs,
+		const SpMcRingBuffer::InputEngineConstraints& ringBufferConstraints)
+	:	StimulusBuffer(
+			producer, deviceAttachmentSpec, histbuffMs, ringBufferConstraints)
+	{}
+
+	~PcloudXyzStimulusBuffer() = default;
+
+	// Non-copyable, movable
+	PcloudXyzStimulusBuffer(const PcloudXyzStimulusBuffer&) = delete;
+	PcloudXyzStimulusBuffer& operator=(const PcloudXyzStimulusBuffer&) = delete;
+	PcloudXyzStimulusBuffer(PcloudXyzStimulusBuffer&&) = default;
+	PcloudXyzStimulusBuffer& operator=(PcloudXyzStimulusBuffer&&) = default;
+};
+
+} // namespace stim_buff
+} // namespace smo
+
+#endif // _LIVOX_GEN1_PCLOUD_XYZ_STIMULUS_BUFFER_H