Snippets for focus management

[chikoski]

This PR adds some snippets about focus management in Compose:

• How to set initial focus
• How to restore keyboard focus

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusExample.kt:133, tag android_compose_touchinput_focus_restoration
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestorationInListDetailLayoutSnippet.kt:77, tag android_compose_touchinput_focus_restoration_listdetail
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestorationSnippets.kt:193, tag android_compose_touchinput_focus_restoration_manually
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestorationSnippets.kt:240, tag android_compose_touchinput_focus_restoration_with_row
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/InitialFocusSnippets.kt:48, tag android_compose_touchinput_initialfocus_basics
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/InitialFocusSnippets.kt:109, tag android_compose_touchinput_initialfocus_with_scrollable_container
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/InitialFocusSnippets.kt:158, tag android_compose_touchinput_initialfocus_with_content_reload

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