handlePluginShutdown method
Handle a 'plugin.shutdown' request. Subclasses can override this method to perform any required clean-up, but cannot prevent the plugin from shutting down.
Throw a RequestFailure if the request could not be handled.
Implementation
Future<PluginShutdownResult> handlePluginShutdown(
PluginShutdownParams parameters) async {
return PluginShutdownResult();
}