Please read the top level epic to understand the idea behind the ObjectState interface.

What needs to be done.

• ensure VersionedObjectState is implemented. It's in a PR here https://github.com/aerogear/apollo-voyager-server/pull/15/files#diff-a85ac538fa2c0de953f22deb6baba56aR10
• Modify the VoyagerConfig interface to accept an ObjectState instance as a parameter. https://github.com/aerogear/apollo-voyager-server/blob/master/packages/apollo-voyager-server/src/config/VoyagerConfig.ts
• Modify the ApolloVoyagerContextProvider class to take the ObjectState instance and to ensure it is present in the resulting context returned from the getContext function. https://github.com/aerogear/apollo-voyager-server/blob/master/packages/apollo-voyager-server/src/context/ApolloVoyagerContextProvider.ts