allow ability to inject constructor arguments when registering actor classes

[hadeed85]

actorRuntime.registerActor(SomeEntity.class); doesn't allow you to inject constructor arguments inside SomeEntity. Using
getDeclaredConstructor().newInstance() or similar approach we should be able to allow constructor arguments whilst registering actor classes.

[artursouza]

This is a design decision for all Dapr SDKs. It is because we implement virtual actors, when actors always exist, so it is never constructed. Instantiating a class in memory is just a representation of the virtual actor. Do you have an example of what you are trying to accomplish and we might see how it can be done with or without virtual actors.