Add snippet for SpatialGltfModel

[amyZepp]

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[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• xr/src/main/java/com/example/xr/compose/SpatialGltfModel.kt:46, tag androidxr_compose_SpatialGltfModelState
• xr/src/main/java/com/example/xr/compose/SpatialGltfModel.kt:54, tag androidxr_compose_SpatialGltfModelMaterial
• xr/src/main/java/com/example/xr/compose/SpatialGltfModel.kt:101, tag androidxr_compose_SpatialGltfModelIntrospection
• xr/src/main/java/com/example/xr/compose/SpatialGltfModel.kt:113, tag androidxr_compose_SpatialGltfModelLoad

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[gemini-code-assist]

Code Review

This pull request introduces a new Jetpack Compose example for XR, demonstrating how to load GLB models, handle animations, and customize materials. Key feedback includes removing the environment-specific local.properties file from version control, fixing a potential null pointer exception when accessing model nodes, and ensuring the alpha component of the material's base color factor aligns with the opaque alpha mode.