TypeResolutionTable

As described in #91.
I was thinking to return an empty sequence, or return a `Maybe`, but then I read the [protocol](https://github.com/GreanTech/AtomEventStore/blob/ad1064b38dc2871e2b6f4a9fbca03589089547b5/AtomEventStore/ITypeResolver.cs#L35-37) of `ITypeResolver`.