Add code snippets for Compose focus documentation suite

[chikoski]

This pull request adds several code snippets for keyboard focus management documents in Compose covering:

• Focus target
• 1D and 2D focus traversal
• Focus groups
• Text field focus behavior
• Capture and release focus
• UI tests

[snippet-bot]

Here is the summary of changes.

You are about to add 24 region tags.

• compose/snippets/src/androidTest/java/com/example/compose/snippets/touchinput/focus/FocusTesting.kt:34, tag android_compose_touchinput_focus_test_setup
• compose/snippets/src/androidTest/java/com/example/compose/snippets/touchinput/focus/FocusTesting.kt:41, tag android_compose_touchinput_focus_test_targets
• compose/snippets/src/androidTest/java/com/example/compose/snippets/touchinput/focus/FocusTesting.kt:60, tag android_compose_touchinput_focus_test_1d_traversal
• compose/snippets/src/androidTest/java/com/example/compose/snippets/touchinput/focus/FocusTesting.kt:99, tag android_compose_touchinput_focus_test_2d_traversal
• compose/snippets/src/androidTest/java/com/example/compose/snippets/touchinput/focus/FocusTesting.kt:128, tag android_compose_touchinput_focus_test_text_fields
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/CaptureFocus.kt:34, tag android_compose_touchinput_focus_capture_focus
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/CaptureFocus.kt:54, tag android_compose_touchinput_focus_free_focus
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusGroup.kt:32, tag android_compose_touchinput_focus_group_on_enter
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusInTextFields.kt:31, tag android_compose_touchinput_focus_text_fields_line_limits
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestoration.kt:46, tag android_compose_touchinput_focus_restore_lazy
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestoration.kt:61, tag android_compose_touchinput_focus_restore_group
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestoration.kt:82, tag android_compose_touchinput_focus_restore_fallback
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestoration.kt:111, tag android_compose_touchinput_focus_restore_navigation_selected
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusRestoration.kt:160, tag android_compose_touchinput_focus_restore_dynamic_list
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTarget.kt:29, tag android_compose_touchinput_focus_target
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTarget.kt:44, tag android_compose_touchinput_focus_target_interactive_ui_element
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTarget.kt:53, tag android_compose_touchinput_focus_target_clickable_modifier
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTarget.kt:65, tag android_compose_touchinput_focus_focusable
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTraversal.kt:32, tag android_compose_touchinput_focus_one_dimensional_traversal
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTraversal.kt:48, tag android_compose_touchinput_focus_customize_one_dimensional_traversal
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusTraversal.kt:78, tag android_compose_touchinput_focus_customize_two_dimensional_traversal
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/FocusedState.kt:31, tag android_compose_touchinput_focus_ripple
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/MoveFocus.kt:34, tag android_compose_touchinput_focus_move_direction
• compose/snippets/src/main/java/com/example/compose/snippets/touchinput/focus/MoveFocus.kt:49, tag android_compose_touchinput_focus_clear_focus

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