Adding snippet for MV-HEVC video playback

[vad710]

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[snippet-bot]

Here is the summary of changes.

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• xr/src/main/java/com/example/xr/scenecore/SpatialVideo.kt:87, tag androidxr_scenecore_surfaceEntityCreateMVHEVC

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[devbridie]

Due to #179 spotless will fail. It seems OK to me though.