[Example App] implement swipe actions on list view

[jessesquires]

This is a little tricky because the API uses index paths instead of item identifiers.

Docs:

• https://developer.apple.com/documentation/uikit/uiswipeactionsconfiguration
• https://developer.apple.com/documentation/uikit/uicollectionlayoutlistconfiguration/3650427-leadingswipeactionsconfiguration
• https://developer.apple.com/documentation/uikit/uicollectionlayoutlistconfiguration/3650428-trailingswipeactionsconfiguratio

Sample code:

• https://developer.apple.com/documentation/uikit/views_and_controls/collection_views/updating_collection_views_using_diffable_data_sources