prow/plugins/plugins.go
func RegisterReviewEventHandler(name string, fn ReviewEventHandler, help HelpProvider) {
	pluginHelp[name] = help
	reviewEventHandlers[name] = fn
}
func RegisterReviewEventHandler(name string, fn ReviewEventHandler, help HelpProvider) {
	pluginHelp[name] = help
	reviewEventHandlers[name] = fn
}
// RegisterReviewEventHandler registers a plugin's github.ReviewEvent handler.