setItem method
Stores value under key in the state data map.
Set saveKey to false to prevent this key from being persisted
across app restarts.
Implementation
void setItem(String key, dynamic value, {bool saveKey = true}) {
state = state.copyWith(data: {
...state.data,
key: value
}, saveKeys: {
...state.saveKeys,
key: saveKey,
});
saveState();
}