chore: flatten src/ to root

ink/events/event.ts

@@ -0,0 +1,11 @@
+export class Event {
+  private _didStopImmediatePropagation = false
+
+  didStopImmediatePropagation(): boolean {
+    return this._didStopImmediatePropagation
+  }
+
+  stopImmediatePropagation(): void {
+    this._didStopImmediatePropagation = true
+  }
+}