Dispatch events after default is successfully set

[quisse]

1. Why is this change necessary?

To be able to trigger actions based on default addresses successes

2. What does this change do, exactly?

Add some events

3. Describe each step to reproduce the issue or behaviour.

4. Please link to the relevant issues (if any).

#3439

5. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfil them.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

	Warnings
⚠️	The Pull Request doesn't contain any changelog file

[mstegmeyer]

Could you change the names of these events? We try to avoid Set due to it being close of "a set of things" / a collection.
Maybe do Switched just like the Route or Changed?

Also: just a code style choice: instead of that rather large switch, maybe do a match? Something like this:

$event = match($type) {
    self::BILLING => new BillingEvent(),
    default => new ShippingEvent(),
};
$this->eventDispatcher->dispatch($event);