feat(event-bus): allow assertions without preventing event execution

[innocenzi]

Closes #1486

This pull request adds a new recordEventDispatches in addition to the existing preventEventHandling. Recording event dispatches swaps to the testing event bus but doesn't prevent dispatches, so assertions are possible.

$this->eventBus->recordEventDispatches();

// ...

$this->eventBus->assertDispatched(FakeEvent::class);

Adding @WendellAdriel as a co-author for his initial work on this in me@wendelladriel.com

Co-authored-by: Wendell Adriel me@wendelladriel.com