feat(views): Add basic notification snippet

[askandroid]

Add a basic notification snippet and associated files to the views module.

Region-Tag: android_views_notifications_build_basic

Testing workflow for GitHub code migration.

[snippet-bot]

Here is the summary of changes.

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• views/src/main/java/com/example/android/views/notifications/NotificationSnippets.java:17, tag android_views_notifications_build_basic

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[cartland]

LGTM for the snippet on this page: https://developer.android.com/develop/ui/views/notifications/build-notification

[cartland]

We should put these imports in the version catalog, like the other imports.

[cartland]

I rebased and fixed the merge conflicts in #640. It might be easier to resolve the code there.