Add a helper/event dispatcher to be informed about on chain events

### What should be done?

Ideally through WebSockets, but the impl can be hidden for now.

### How should it be done?

Events the consumer can be informed about: new note arrived, transaction confirmed etc.
Note: There can be an overlap with the API simplifcation story, which adds the ability to await transaction send, which implicitly waits for confirmation.

### When is this task done?

Goal: Remove the need for await new Promise((resolve) => setTimeout(resolve, 10000))

### Additional context

_No response_

Look for existing event handling or WebSocket code in the SDK. The goal is to create a helper that dispatches events like 'new note arrived' and 'transaction confirmed'. Start by understanding the current transaction sending and confirmation flow. Check if there are existing patterns for async operations or listeners. Implement a dispatcher that eliminates the need for manual timeouts, then test by subscribing to events and verifying they fire correctly.

Vom Indexierungsmodell aus dem Issue-Text verfasst.