replace BlazorStateComponent to IBlazorStateComponent in Subscriptions

[megafetis]

It will help to create subscribable LayoutComponentBase components and InputBase components using method from documentation:

protected T GetState<T>()
    {
      Type stateType = typeof(T);
      Subscriptions.Add(stateType, this); // where this is IBlazorStateComponent
      return Store.GetState<T>();
    }

[StevenTCramer]

@megafetis Thanks for the PR. It looks good. Thanks much.

[neozhu]

hello @megafetis
How to inherit BlazorStateComponent on the main page that has inherited LayoutComponentBase?
as we know, the blazor component does not support multi inherit classes.

[StevenTCramer]

@neozhu as you state you can't inherit from multiple classes in C#. But you can implement multiple interfaces. So you could implement IBlazorStateComponent in your Layout Component. See #305.

[neozhu]

@StevenTCramer Thanks for the tip, I got it

[StevenTCramer]

@neozhu I move the Layout functionality into a Page component.

https://github.dev/TimeWarpEngineering/timewarp-architecture/tree/master/Source/TimeWarp.Architecture.Template/templates/TimeWarp.Architecture/Source/ContainerApps/Web/Web.Spa/Components

My actual layout is nearly empty.

https://github.dev/TimeWarpEngineering/timewarp-architecture/tree/master/Source/TimeWarp.Architecture.Template/templates/TimeWarp.Architecture/Source/ContainerApps/Web/Web.Spa/Components