Feature Request: Add Unsubscribe All

[codeBelt]

Can you add a unsubscribeAll or offAll method on the event bus so all listeners can be removed with one call?

const EventBus = createEventBus({ events: MyEvents });

EventBus.ping.on(() => { console.log("pong"); });
EventBus.say.on("michel", (words) => { console.log("michel said", words); });

// Add a unsubscribe all method
EventBus.unsubscribeAll();