Consistent event name usage (#3228)

.changes/consistent-event-name-usage.md

@@ -0,0 +1,5 @@
+---
+"api": minor
+---
+
+Change the `event` field of the `Event` interface to type `EventName` instead of `string`.

tooling/api/src/event.ts

@@ -16,7 +16,7 @@ import { LiteralUnion } from 'type-fest'
 
 interface Event<T> {
   /** Event name */
-  event: string
+  event: EventName
   /** Event identifier used to unlisten */
   id: number
   /** Event payload */