[POI-817] SSAO to use a single UnsafePass (RenderGraph optimization) + Adding a Game Camera helper + Adding a SetKeyword overload

* Optimize RenderGraph CPU cost by converting Screen Space Ambient Occlusion (SSAO) from many RasterPasses into a single UnsafePass.
* Adds a `isGameCamera` to UniversalCameraData (Already had one for scene and preview cameras)
* Adds an overload for SetKeyword in CoreUtils that accepts LocalKeyword.

[POI-817](https://jira.unity3d.com/browse/POI-817)
[GFXRPF-172](https://jira.unity3d.com/browse/GFXRPF-172)

Author: ellioman

Packages/com.unity.render-pipelines.core/Runtime/Utilities/CoreUtils.cs

@@ -1156,7 +1156,7 @@ public static void SetKeyword(BaseCommandBuffer cmd, string keyword, bool state)
 
         // Caution: such a call should not be use interlaced with command buffer command, as it is immediate
         /// <summary>
-        /// Set a keyword immediatly on a Material.
+        /// Set a keyword immediately on a Material.
         /// </summary>
         /// <param name="material">Material on which to set the keyword.</param>
         /// <param name="keyword">Keyword to set on the material.</param>
@@ -1169,6 +1169,21 @@ public static void SetKeyword(Material material, string keyword, bool state)
                 material.DisableKeyword(keyword);
         }
 
+        // Caution: such a call should not be use interlaced with command buffer command, as it is immediate
+        /// <summary>
+        /// Set a keyword immediately on a Material.
+        /// </summary>
+        /// <param name="material">Material on which to set the keyword.</param>
+        /// <param name="keyword">Keyword to set on the material.</param>
+        /// <param name="state">Value of the keyword to set on the material.</param>
+        public static void SetKeyword(Material material, LocalKeyword keyword, bool state)
+        {
+            if (state)
+                material.EnableKeyword(keyword);
+            else
+                material.DisableKeyword(keyword);
+        }
+
         /// <summary>
         /// Set a keyword to a compute shader
         /// </summary>

Packages/com.unity.render-pipelines.universal/Runtime/FrameData/UniversalCameraData.cs

@@ -257,6 +257,11 @@ internal bool requireSrgbConversion
             }
         }
 
+        /// <summary>
+        /// True if the camera rendering is for regular in-game.
+        /// </summary>
+        public bool isGameCamera => cameraType == CameraType.Game;
+
         /// <summary>
         /// True if the camera rendering is for the scene window in the editor.
         /// </summary>