Evaluate Request for pointer type expressions should return memoryReference contained in the pointer

As per the discussion in https://github.com/eclipse-cdt-cloud/cdt-gdb-adapter/pull/544 and also as per the documentation of MSDAP [Evaluate Request](https://microsoft.github.io/debug-adapter-protocol/specification#Requests_Evaluate)

For a an expression that is pointer typed, the returned memory reference should be what is being pointed at by the pointer and not the address of the pointer itself. This is currently not the behaviour