Add code snippets for compose-scaling

[sushantsikka]

Adding code snippets for the new doc "Scale media content across form factors".

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/media/ComposeScaling.kt:52, tag android_media3_compose_scaling_non_immersive_insets
• compose/snippets/src/main/java/com/example/compose/snippets/media/ComposeScaling.kt:96, tag android_media3_compose_scaling_immersive_insets
• compose/snippets/src/main/java/com/example/compose/snippets/media/ComposeScaling.kt:133, tag android_media3_compose_scaling_derived_media_query
• compose/snippets/src/main/java/com/example/compose/snippets/media/ComposeScaling.kt:155, tag android_media3_compose_scaling_player_fit
• compose/snippets/src/main/java/com/example/compose/snippets/media/ComposeScaling.kt:169, tag android_media3_compose_scaling_dynamic_toggle

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