feat(Effects): stringify action on invalid action

Message before: ERROR Error: Effect "AuthEffects.login$" dispatched an invalid action: [object Object]
Message after: ERROR Error: Effect "AuthEffects.login$" dispatched an invalid action: [{"payload":{"user":{"name":"User"}},"type":"[Auth] Login Success"}]

modules/effects/src/effect_notification.ts

@@ -37,7 +37,7 @@ function reportInvalidActions(
         new Error(
           `Effect ${getEffectName(
             output
-          )} dispatched an invalid action: ${action}`
+          )} dispatched an invalid action: ${stringify(action)}`
         )
       );
     }
@@ -57,3 +57,11 @@ function getEffectName({
 
   return `"${sourceName}.${propertyName}${isMethod ? '()' : ''}"`;
 }
+
+function stringify(action: any) {
+  try {
+    return JSON.stringify(action);
+  } catch {
+    return action;
+  }
+}