[FEATURE] MonoHooks should be able to call instancer-events

[soraphis]

The current implementation of MonoHooks: https://github.com/unity-atoms/unity-atoms/blob/master/Packages/MonoHooks/Runtime/Hooks/VoidHook.cs#L16-L22

Should use VoidBaseEventReference and GameObjectEventReference instead.

Note that an OnAwakeHook would potentially call it's event BEFORE it is created in OnEnable ( https://github.com/unity-atoms/unity-atoms/blob/master/Packages/Core/Runtime/EventInstancers/AtomEventInstancer.cs#L43-L53 )

for that reason, the "inMemoryCopy" should be created on-demand in the Event getter property if it does not exist yet, and the component itself is enabled.

[soraphis]

since this is a breaking change .... it can't be in the 4.x branch...

[soraphis]

probably duplicate of #271