Add LOAD_TEXTURE3D() and LOAD_TEXTURE3D_LOD()

ScriptableRenderPipeline/Core/ShaderLibrary/API/D3D11.hlsl

 #define LOAD_TEXTURE2D_MSAA(textureName, unCoord2, sampleIndex)     textureName.Load(unCoord2, sampleIndex)
 #define LOAD_TEXTURE2D_ARRAY(textureName, unCoord2, index)          textureName.Load(int4(unCoord2, index, 0))
 #define LOAD_TEXTURE2D_ARRAY_LOD(textureName, unCoord2, index, lod) textureName.Load(int4(unCoord2, index, lod))
+#define LOAD_TEXTURE3D(textureName, unCoord3)                       textureName.Load(int4(unCoord3, 0))
+#define LOAD_TEXTURE3D_LOD(textureName, unCoord3, lod)              textureName.Load(int4(unCoord3, lod))
 
 #define GATHER_TEXTURE2D(textureName, samplerName, coord2)                textureName.Gather(samplerName, coord2)
 #define GATHER_TEXTURE2D_ARRAY(textureName, samplerName, coord2, index)   textureName.Gather(samplerName, float3(coord2, index))

ScriptableRenderPipeline/Core/ShaderLibrary/API/Metal.hlsl

 #define LOAD_TEXTURE2D_MSAA(textureName, unCoord2, sampleIndex)     textureName.Load(unCoord2, sampleIndex)
 #define LOAD_TEXTURE2D_ARRAY(textureName, unCoord2, index)          textureName.Load(int4(unCoord2, index, 0))
 #define LOAD_TEXTURE2D_ARRAY_LOD(textureName, unCoord2, index, lod) textureName.Load(int4(unCoord2, index, lod))
+#define LOAD_TEXTURE3D(textureName, unCoord3)                       textureName.Load(int4(unCoord3, 0))
+#define LOAD_TEXTURE3D_LOD(textureName, unCoord3, lod)              textureName.Load(int4(unCoord3, lod))
 
 #define GATHER_TEXTURE2D(textureName, samplerName, coord2)                textureName.Gather(samplerName, coord2)
 #define GATHER_TEXTURE2D_ARRAY(textureName, samplerName, coord2, index)   textureName.Gather(samplerName, float3(coord2, index))

ScriptableRenderPipeline/Core/ShaderLibrary/API/PSSL.hlsl

 #define LOAD_TEXTURE2D_MSAA(textureName, unCoord2, sampleIndex)     textureName.Load(unCoord2, sampleIndex)
 #define LOAD_TEXTURE2D_ARRAY(textureName, unCoord2, index)          textureName.Load(int4(unCoord2, index, 0))
 #define LOAD_TEXTURE2D_ARRAY_LOD(textureName, unCoord2, index, lod) textureName.Load(int4(unCoord2, index, lod))
+#define LOAD_TEXTURE3D(textureName, unCoord3)                       textureName.Load(int4(unCoord3, 0))
+#define LOAD_TEXTURE3D_LOD(textureName, unCoord3, lod)              textureName.Load(int4(unCoord3, lod))
 
 #define GATHER_TEXTURE2D(textureName, samplerName, coord2)                textureName.Gather(samplerName, coord2)
 #define GATHER_TEXTURE2D_ARRAY(textureName, samplerName, coord2, index)   textureName.Gather(samplerName, float3(coord2, index))

ScriptableRenderPipeline/Core/ShaderLibrary/API/Vulkan.hlsl

 #define LOAD_TEXTURE2D_MSAA(textureName, unCoord2, sampleIndex)     textureName.Load(unCoord2, sampleIndex)
 #define LOAD_TEXTURE2D_ARRAY(textureName, unCoord2, index)          textureName.Load(int4(unCoord2, index, 0))
 #define LOAD_TEXTURE2D_ARRAY_LOD(textureName, unCoord2, index, lod) textureName.Load(int4(unCoord2, index, lod))
+#define LOAD_TEXTURE3D(textureName, unCoord3)                       textureName.Load(int4(unCoord3, 0))
+#define LOAD_TEXTURE3D_LOD(textureName, unCoord3, lod)              textureName.Load(int4(unCoord3, lod))
 
 #define GATHER_TEXTURE2D(textureName, samplerName, coord2)                textureName.Gather(samplerName, coord2)
 #define GATHER_TEXTURE2D_ARRAY(textureName, samplerName, coord2, index)   textureName.Gather(samplerName, float3(coord2, index))

ScriptableRenderPipeline/Core/ShaderLibrary/API/XBoxOne.hlsl

 #define LOAD_TEXTURE2D_MSAA(textureName, unCoord2, sampleIndex)     textureName.Load(unCoord2, sampleIndex)
 #define LOAD_TEXTURE2D_ARRAY(textureName, unCoord2, index)          textureName.Load(int4(unCoord2, index, 0))
 #define LOAD_TEXTURE2D_ARRAY_LOD(textureName, unCoord2, index, lod) textureName.Load(int4(unCoord2, index, lod))
+#define LOAD_TEXTURE3D(textureName, unCoord3)                       textureName.Load(int4(unCoord3, 0))
+#define LOAD_TEXTURE3D_LOD(textureName, unCoord3, lod)              textureName.Load(int4(unCoord3, lod))
 
 #define GATHER_TEXTURE2D(textureName, samplerName, coord2)                textureName.Gather(samplerName, coord2)
 #define GATHER_TEXTURE2D_ARRAY(textureName, samplerName, coord2, index)   textureName.Gather(samplerName, float3(coord2, index))