Fix memory leaks in actor cleanup (#5408)

* Clear event listeners and actor state on stop

* Update packages/core/src/actors/callback.ts

Co-authored-by: Mateusz Burzyński <[email protected]>

---------

Co-authored-by: Mateusz Burzyński <[email protected]>

Author: GrigoryEvko

packages/core/src/actors/callback.ts

@@ -230,6 +230,8 @@ export function fromCallback<
           error: undefined
         };
 
+        instanceStates.delete(actorScope.self);
+        callbackState.receivers?.clear();
         callbackState.dispose?.();
         return state;
       }

packages/core/src/actors/promise.ts

@@ -165,6 +165,7 @@ export function fromPromise<
           };
         case XSTATE_STOP: {
           controllerMap.get(scope.self)?.abort();
+          controllerMap.delete(scope.self);
           return {
             ...state,
             status: 'stopped',

packages/core/src/createActor.ts

@@ -635,12 +635,14 @@ export class Actor<TLogic extends AnyActorLogic>
       }
     }
     this.observers.clear();
+    this.eventListeners.clear();
   }
   private _reportError(err: unknown): void {
     if (!this.observers.size) {
       if (!this._parent) {
         reportUnhandledError(err);
       }
+      this.eventListeners.clear();
       return;
     }
     let reportError = false;
@@ -655,6 +657,7 @@ export class Actor<TLogic extends AnyActorLogic>
       }
     }
     this.observers.clear();
+    this.eventListeners.clear();
     if (reportError) {
       reportUnhandledError(err);
     }