Port entities snippets from DAC

[devbridie]

Port snippets from Create, control, and manage entities.

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• xr/src/main/java/com/example/xr/scenecore/Entities.kt:35, tag androidxr_scenecore_entity_setPoseExample
• xr/src/main/java/com/example/xr/scenecore/Entities.kt:46, tag androidxr_scenecore_entity_hideEntity
• xr/src/main/java/com/example/xr/scenecore/Entities.kt:53, tag androidxr_scenecore_entity_entitySetScale
• xr/src/main/java/com/example/xr/scenecore/Entities.kt:60, tag androidxr_scenecore_moveableComponentExample
• xr/src/main/java/com/example/xr/scenecore/Entities.kt:77, tag androidxr_scenecore_resizableComponentExample
• xr/src/main/java/com/example/xr/scenecore/Entities.kt:86, tag androidxr_scenecore_interactableComponentExample

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