Additional filtering on event.pattern

[qhello]

Hi @fredericbarthelet,

WDYT about adding optional additional filtering to event.pattern? This would allow to listen to a subset of event patterns.

Right now we're accomplishing it by doing something like this:

const eventBridgePattern: DeepPartial<Input> = {
  detail: { status: [RentalDeliveryStatus.DELIVERED] as unknown as Input['detail']['status'] }, // Make sure this value is somewhat linked to event type
};

...

events: [
    {
      eventBridge: {
        eventBus: 'bus',
        // Augmenting the default typebridge pattern, to only listen to events with status "DELIVERED"
        pattern: {
          ...event.pattern,
          ...eventBridgePattern,
        },
      },
    },
  ],

would be amazing in our use case to have something more like this: event.pattern({ status: "Delivered" })

let me know what you think, would be happy to create a PR regarding this 😊