chore: ability to group events on redis event bus (#7655)

* chore: ability to group events on redis event bus

* chore: fix tests

* Update packages/modules/event-bus-redis/src/services/event-bus-redis.ts

Co-authored-by: Adrien de Peretti <adrien.deperetti@gmail.com>

* chore: change shape of input and body data

* chore: fix builds

* chore: address comments

* chore: fix unit test

---------

Co-authored-by: Adrien de Peretti <adrien.deperetti@gmail.com>

integration-tests/modules/__tests__/notification/admin/notification.spec.ts

@@ -165,7 +165,8 @@ medusaIntegrationTestRunner({
           )
           const logSpy = jest.spyOn(logger, "info")
 
-          await eventBus.emit("order.created", {
+          await eventBus.emit({
+            eventName: "order.created",
             data: {
               order: {
                 id: "1234",