signOut method
Sign out if you are already signed in.
すでにサインインしている場合サインアウトします。
Implementation
Future<void> signOut() async {
await _initialize();
final account = active;
if (account == null) {
throw Exception(
"You are not signed in. Please sign in with [signIn] first.",
);
}
_activeId = null;
_data._clearTemporary();
_data._clearCurrent();
await onSaved?.call(this);
}