Migrate snippets from "Add spatial video to your app"

[devbridie]

Port snippets from Add spatial video to your app.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• xr/src/main/java/com/example/xr/scenecore/SpatialVideo.kt:30, tag androidxr_scenecore_surfaceEntityCreate
• xr/src/main/java/com/example/xr/scenecore/SpatialVideo.kt:53, tag androidxr_scenecore_surfaceEntityCreateSbs
• xr/src/main/java/com/example/xr/scenecore/SpatialVideo.kt:70, tag androidxr_scenecore_surfaceEntityCreateTb

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[vad710]

We should revisit the positioning of the 180 sphere - I would expect it to be similar to the quad.