Add CasaExample FBX, update materials & packages

Add a new House asset (Assets/Game/House/CasaExample.fbx) with corresponding meta and folder metadata. Adjust World Canvas material (removed _SPECULAR_COLOR, disabled SHADOWCASTER pass, enabled XR motion vectors flag) and update Save Camera RenderTexture serialized settings. Update SampleScene LFS entry and bump Unity package versions in Packages/manifest.json (several dependency version updates). Also update ProjectSettings (project asset/hash and ProjectVersion to 6000.3.8f1).

Assets/Game Kit Controller/Shaders/World Canvas.mat

@@ -26,7 +26,6 @@ Material:
   m_ModifiedSerializedProperties: 0
   m_ValidKeywords:
   - _ALPHAPREMULTIPLY_ON
-  - _SPECULAR_COLOR
   - _SURFACE_TYPE_TRANSPARENT
   m_InvalidKeywords: []
   m_LightmapFlags: 4
@@ -38,6 +37,7 @@ Material:
   disabledShaderPasses:
   - MOTIONVECTORS
   - DepthOnly
+  - SHADOWCASTER
   m_LockedProperties: 
   m_SavedProperties:
     serializedVersion: 3
@@ -158,6 +158,7 @@ Material:
     - _Surface: 1
     - _UVSec: 0
     - _UseUIAlphaClip: 0
+    - _XRMotionVectorsPass: 1
     - _ZWrite: 0
     m_Colors:
     - _BaseColor: {r: 1, g: 1, b: 1, a: 1}