Shows the messages, dialogs and busy indicators that components below it ask for through
useNotifier.
Remarks
Providers stack per method, and the outermost wins. An app that wraps a studio in a provider
with only showMessage replaces the studio's toasts and keeps its dialogs.
The provider affects React components only. To redirect the SDK's own messages, override the
global Notifier.
Shows the messages, dialogs and busy indicators that components below it ask for through useNotifier.