onAuthStateChange method
Implementation
GotrueSubscription onAuthStateChange(Callback callback) {
final id = uuid.generateV4();
final GoTrueClient self = this;
final subscription = Subscription(
id: id,
callback: callback,
unsubscribe: () {
self.stateChangeEmitters.remove(id);
},
);
stateChangeEmitters[id] = subscription;
return GotrueSubscription(data: subscription);
}