Migrate Snackbar snippets (showing and action)

[hamen]

Code snippets are for:

• https://developer.android.com/develop/ui/views/notifications/snackbar/showing
• https://developer.android.com/develop/ui/views/notifications/snackbar/action

List of modifications:

• Showing page: Added Kotlin snippets for creating and displaying a Snackbar using Snackbar.make() and .show(), as well as chained invocation (views module).
• Showing page: Added the CoordinatorLayout skeleton as a layout resource (views module). It declares @+id/myCoordinatorLayout, which the chained Snackbar.make() snippet looks up.
• Action page: Added Kotlin snippets for Snackbar.setAction with custom OnClickListener and SnackbarHost with SnackbarHostState in Compose (views and compose:snippets modules).

Deviations from the page:

• The layout snippet uses androidx.coordinatorlayout.widget.CoordinatorLayout. The page shows android.support.design.widget.CoordinatorLayout, which is the Support Library class and is no longer available. The page text needs the same change.
• The layout snippet drops the unused xmlns:app declaration.

[kkuan2011]

Looks good once comments are addressed, then can you add Aaron for review? and move it out of draft mode?

[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/components/Snackbar.kt:46, tag android_compose_components_snackbar_host
• views/src/main/java/com/example/example/snippet/views/notifications/snackbar/Action.kt:24, tag android_views_snackbar_action_listener
• views/src/main/java/com/example/example/snippet/views/notifications/snackbar/Action.kt:36, tag android_views_snackbar_set_action
• views/src/main/java/com/example/example/snippet/views/notifications/snackbar/Showing.kt:28, tag android_views_snackbar_make
• views/src/main/java/com/example/example/snippet/views/notifications/snackbar/Showing.kt:32, tag android_views_snackbar_show
• views/src/main/java/com/example/example/snippet/views/notifications/snackbar/Showing.kt:38, tag android_views_snackbar_make_show
• views/src/main/res/layout/snackbar_coordinator_layout.xml:17, tag android_views_snackbar_coordinator_layout

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