identifyUser method
Identifies a user across all analytics providers.
The userId parameter is a unique identifier for the user, and
traits contains any additional user properties to track.
Example:
await analytics.identifyUser(
'user123',
traits: {'plan': 'premium', 'company': 'Acme Inc'},
);
Implementation
@override
Future<void> identifyUser(String userId, {Map<String, dynamic>? traits}) =>
_fanOut((provider) => provider.identifyUser(userId, traits: traits));