Drop ApplicationInterface

[Xerkus]

Q	A
Documentation	no
Bugfix	no
BC Break	yes
New Feature	no
RFC	no
QA	no

Description

ApplicationInterface was never really utilized and where application instance were expected often time it was the Laminas\Mvc\Application implicitly which is not type safe.

Interface does not provide a lot of value now and even more reduntant with the direction towards pure dependency injection from a mix of DI and service locator.

Make EventManager instance a required constructor parameter instead of optional pulled from injected container in the same constructor. Downgrade Application to EventsCapableInterface removing ability to set different event manager instance post instantiation.

Psalm issues which are not directly related intentionally left unfixed to be handled in a separate PR.