isInstantiatedIn method
Checks whether this store is instantiated in scope.
Returns true when the store value has already been built.
Implementation
bool isInstantiatedIn(LevitScope scope, {String? tag}) {
final instanceKey =
tag != null ? 'ls_store_${_getStoreTag(this, tag)}' : _defaultKey;
return scope.isInstantiated<_LevitStoreInstance<T>>(tag: instanceKey);
}