WIP: FEATURE: Centralized event handling

[bwaidelich]

This centralizes the invokation of when*() event handlers to a central
class that ensures the following invokation order:

1. beforeInvokingEventListenerMethod() (when implementing ActsBeforeInvokingEventListenerMethodsInterface)
2. when*() (the actual event handler)
3. saveHighestAppliedSequenceNumber() (when implementing AsynchronousEventListenerInterface)
4. afterInvokingEventListenerMethod() (when implementing ActsAfterInvokingEventListenerMethodsInterface)

This allows EventListeners to wrap the event handling in transactions for example:

class SomeEventListener implements AsynchronousEventListenerInterface, ActsBeforeInvokingEventListenerMethodsInterface, ActsAfterInvokingEventListenerMethodsInterface
{
  public function beforeInvokingEventListenerMethod(EventInterface $event): void
  {
    // start transaction
  }

  public function whenSomeEvent(SomeEvent $event): void
  {
     // db interaction
  }

  public function saveHighestAppliedSequenceNumber(int $sequenceNumber): void
  {
    // update sequence number in db
  }

  public function afterInvokingEventListenerMethod(EventInterface $event): void
  {
    // commit transaction
  }
}

This change...

• Renames EventListenerLocator to EventListenerManager – the class
  is now also responsible for invoking event listeners
• Removes EventPublisher::catchUp() and moves the remaining logic to
  the EventCommandController
• Introduces an ActsAfterInvokingEventListenerMethodsInterface marker
  interface, that is used similarily to ActsBeforeInvokingEventListenerMethodsInterface
  and allows to wrap event handling in a transaction
• Introduces a new EventCantBeAppliedException that allows for easier handling of
  exceptions during event handling (see Event watcher should not quit upon errors/exceptions #161)
• Removes an unused projectionCache configuration

Related: #159

[bwaidelich]

NOTE: To be transaction-safe the getHighestAppliedSequenceNumber() method has to be called after beforeInvokingEventListenerMethod() but I don't know (yet) how to achieve this

[bwaidelich]

We now have a plan for a rework that includes "HighestAppliedSequenceNumber" retrieval/update in the transaction. I'll push a follow-up asap

[bwaidelich]

WIP WIP WIP

[skurfuerst]

@bwaidelich we can close this one, right?

[bwaidelich]

yes