3564 [shared_preferences] Migrate examples to NNBD (cla: yes, nnbd, p: shared_preferences, platform-linux, platform-macos, platform-windows)

3565 [shared_preferences] fix crash when list type is dynaimc (cla: yes, nnbd, p: shared_preferences, waiting for tree to go green)

3568 [path_provider] Bump platform interface package to stable NNBD (cla: yes, nnbd, p: path_provider)

3569 [flutter_plugin_android_lifecycle] Bump version for NNBD stable (cla: yes, nnbd, p: flutter_plugin_android_lifecycle)

3570 [url_launcher] Bump platform interface package to stable NNBD (cla: yes, nnbd, p: url_launcher)