Add IInteroperable interface

[Jim8y]

Summary

• add IInteroperable interface for objects convertible to StackItem
• include default Clone and FromReplica helpers that reuse StackItem conversion

Testing

• dotnet build

[Jim8y]

IInteroperable.cs was in neo core, but this actually should be a part of the vm.

[erikzhang]

I think it's not a part of VM. In VM, it is converted to an Array or Struct.

[Jim8y]

I think it's not a part of VM. In VM, it is converted to an Array or Struct.

Its an interface that defines how outside modules interact with vm types, why its not part of the vm, definately should be the vm to define what interface to implement to interact with the vm itself. and we gonna add a new vm, then we will have differnt IInteroperable interface, maybe another name, but same responsibility.

[Jim8y]

but this actually is not a big deal.....