Add support for service interface inheritance

[FejZa]

Reality Collective - Service Framework Feature Request

Is your feature request related to a problem? Please describe

So this is sorts of an edge case issue and there is many ways to work around it. But maybe something easy enough to fix.

Image the following scenario:

• A user is using the Reality Toolkit
• They create a custom input service definition IMyInputService that is defined as public interface IMyInputService : IInputService
• Then they create an implementation of that service and register it
• Now all Reality Toolkit services that depend on IInputService will still fail to look it up because IMyInputService is not identified as a valid IInputService

[SimonDarksideJ]

Completed as of #110