GFXLIGHT-1573: Path tracing package migration to U6

Author: pigselated

Packages/com.unity.render-pipelines.core/Editor/PathTracing.meta

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+area: Lighting

Packages/com.unity.render-pipelines.core/Editor/PathTracing/.buginfo

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+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("Assembly-CSharp-Editor-testable")]
+[assembly: InternalsVisibleTo("Unity.RenderPipelines.Core.Editor")]

Packages/com.unity.render-pipelines.core/Editor/PathTracing/AssemblyInfo.cs

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+using UnityEngine;
+
+namespace UnityEditor.PathTracing.LightBakerBridge
+{
+    // This must be in its own file, otherwise the associated ScriptedImporter will malfunction.
+    internal class BakeImport : ScriptableObject
+    {
+        public string BakeInputPath;
+        public string LightmapRequestsPath;
+        public string LightProbeRequestsPath;
+        public string BakeOutputFolderPath;
+        public int ProgressPort;
+    }
+}