dispose method
void
dispose()
Implementation
void dispose() {
if (!_subscribedCompleter.isCompleted) {
_subscribedCompleter.complete();
}
for (final notifier in _rowNotifiers.values) {
notifier.dispose();
}
_rowNotifiers.clear();
rows.dispose();
lastBatch.dispose();
_onInsertController.close();
_onUpdateController.close();
_onDeleteController.close();
}