Alternate entry point

[dpi]

Aka designated factory / constructor

\Pinto\ObjectType\ObjectTypeDiscovery::definitionForThemeObject computes an entry point as where the \Pinto\ObjectType\ObjectTypeInterface is defined at. But that doesnt make sense for inheritance/enum/enum-case options.

But most importantly it should be possible to [Slots(bindPromotedProperties)]) while allowing constructor to be private.

So I think we need another attr, just like Build, to designate the entry point.

Even though entry point isnt really used yet as a concept quite yet.

[dpi]

Perhaps this just needs to be optional, as you might want another class or a subclass to be an entry point.