Adding code snippets for wake locks doc

[asolovay]

Starting with the code snippets to add and release a wake lock, we can add other snippets later.

Used by docs in:

https://developer.android.com/develop/background-work/background-tasks/awake/wakelock/

The actual snippets used on the DAC pages are bracketed by the [START ...] and [END ...] comments; everything else is just scaffolding to get the snippet to compile.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• misc/src/main/java/com/example/snippets/backgroundwork/WakeLockSnippetsJava.java:16, tag android_backgroundwork_wakelock_create_java
• misc/src/main/java/com/example/snippets/backgroundwork/WakeLockSnippetsJava.java:25, tag android_backgroundwork_wakelock_release_java
• misc/src/main/java/com/example/snippets/backgroundwork/WakeLockSnippetsKotlin.kt:27, tag android_backgroundwork_wakelock_create_kotlin
• misc/src/main/java/com/example/snippets/backgroundwork/WakeLockSnippetsKotlin.kt:41, tag android_backgroundwork_wakelock_release_kotlin

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