Migrate Control external devices snippets

[hamen]

Code snippets are for:

• https://developer.android.com/develop/ui/views/device-control

List of modifications:

• Device-control page: Added ControlsProviderService implementation with reactive flows and control actions.
• Device-control page: Formatted elisions as // ... per D22 with silent excludes for compiling fidelity.
• Device-control page: Replaced hardcoded snippets on DAC with github.code_snippet macros.

Snippets not migrated:

• Snippet 1 (line 142): AndroidManifest.xml service declaration.
• Snippet 4 (line 336): Gradle build configuration dependencies block.

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• views/src/main/java/com/example/example/snippet/views/devicecontrol/MyCustomControlService.kt:51, tag android_views_device_control_declare_service
• views/src/main/java/com/example/example/snippet/views/devicecontrol/MyCustomControlService.kt:70, tag android_views_device_control_declare_constants
• views/src/main/java/com/example/example/snippet/views/devicecontrol/MyCustomControlService.kt:104, tag android_views_device_control_create_publisher_all_available
• views/src/main/java/com/example/example/snippet/views/devicecontrol/MyCustomControlService.kt:156, tag android_views_device_control_create_publisher_for
• views/src/main/java/com/example/example/snippet/views/devicecontrol/MyCustomControlService.kt:233, tag android_views_device_control_perform_control_action

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