refactor(schema): extract public event definitions (#33579)

packages/schema/src/session-compaction-event.ts

@@ -0,0 +1,13 @@
+export * as SessionCompactionEvent from "./session-compaction-event"
+
+import { Event } from "./event"
+import { SessionID } from "./session-id"
+
+export const Compacted = Event.define({
+  type: "session.compacted",
+  schema: {
+    sessionID: SessionID,
+  },
+})
+
+export const Definitions = Event.inventory(Compacted)