Add snippets for /training/wearables/always-on

[ithinkihaveacat]

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[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• wear/src/main/java/com/example/wear/snippets/alwayson/AmbientLifecycleObserver.kt:23, tag android_wear_ongoing_activity_ambientlifecycleobserver
• wear/src/main/java/com/example/wear/snippets/alwayson/AmbientLifecycleObserver.kt:45, tag android_wear_ongoing_activity_ambientlifecycleobserver_oncreate
• wear/src/main/java/com/example/wear/snippets/alwayson/AmbientLifecycleObserver.kt:56, tag android_wear_ongoing_activity_ambientlifecycleobserver_ondestroy

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