Adds sample for rotary and timepicker

[kul3r4]

This PR partially fixes https://developer.android.com/training/wearables/compose/rotary-input:

• Adds an example for a scrollable screen where rotary can be used to scroll
• Adds an example for a TimePicker to demonstrate how to use rotary on a Picker + focus

A follow up PR will add the remaining part of the DAC page.

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 3 region tags.

- [wear/src/main/java/com/example/wear/snippets/rotary/Rotary.kt:66](https://github.com/android/snippets/blob/184d4348288bea29053e0873d728d11a221dd06e/wear/src/main/java/com/example/wear/snippets/rotary/Rotary.kt#L66), tag `android_wear_rotary_input` - [wear/src/main/java/com/example/wear/snippets/rotary/Rotary.kt:107](https://github.com/android/snippets/blob/184d4348288bea29053e0873d728d11a221dd06e/wear/src/main/java/com/example/wear/snippets/rotary/Rotary.kt#L107), tag `android_wear_rotary_input_picker` - [wear/src/main/java/com/example/wear/snippets/voiceinput/VoiceInputScreen.kt:70](https://github.com/android/snippets/blob/184d4348288bea29053e0873d728d11a221dd06e/wear/src/main/java/com/example/wear/snippets/voiceinput/VoiceInputScreen.kt#L70), tag `android_wear_voice_input`

You are about to delete 1 region tag.

- [wear/src/main/java/com/example/wear/snippets/voiceinput/VoiceInputScreen.kt:66](https://github.com/android/snippets/blob/1ef854252f92e5ab17afb2fb4fa1483695c7e47c/wear/src/main/java/com/example/wear/snippets/voiceinput/VoiceInputScreen.kt#L66), tag `android_wear_voice_input`

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