feat(physics): wire physx sdk into build

engine/third_party/physx/source/gpusolver/include/PxgPartitionNode.h

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+// Copyright (c) 2008-2025 NVIDIA Corporation. All rights reserved.
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
+
+#ifndef PXG_PARTITION_NODE_H
+#define PXG_PARTITION_NODE_H
+
+#include "PxNodeIndex.h"
+
+namespace physx
+{
+	struct PartitionIndexData
+	{
+		PxU16 mPartitionIndex;		//! The current partition this edge is in. Used to find the edge efficiently. PxU8 is probably too small (256 partitions max) but PxU16 should be more than enough
+		PxU8 mPatchIndex;			//! The patch index for this partition edge. There may be multiple entries for a given edge if there are multiple patches.
+		PxU8 mCType;				//! The type of constraint this is (PxgEdgeType)
+		PxU32 mPartitionEntryIndex;	//! index of partition edges for this partition
+	};
+
+	// PT: stored in incremental partition code's mPartitionNodeArray,
+	// indexed by a partition edge's unique index.
+	struct PartitionNodeData
+	{
+		// PT: copies of PartitionEdge' node indices (the nodes connected by this edge)
+		// - created in PxgIncrementalPartition::addEdge_Stage1
+		PxNodeIndex mNodeIndex0;
+		PxNodeIndex mNodeIndex1;
+
+		// PT: links to next edge unique indices containing the same nodes
+		// - computed in PxgIncrementalPartition::addEdge_Stage2 => PxgIncrementalPartition::addEdgeInternal
+		// - used in constraintContactBlockPrePrepLaunch / constraint1DBlockPrePrepLaunch
+		// - unclear what we need this for
+		PxU32 mNextIndex[2];
+	};
+}
+#endif