Adding v1.3.14-style serialization

[Aaronontheweb]

No description provided.

[Aaronontheweb]

Disabled the serialization implementation, but added the serialization spec.

Bad news is: Akka.Persistence.MongoDb doesn't pass any of the Akka.Persistence.TCK requirements using either binary or object storage, and it's unlikely that it will without some major and possibly breaking changes.

[Aaronontheweb]

Binary serialization for MongoDbSnapshotStore should now pass.

[Aaronontheweb]

Need to handle better serialization support for Tagged - causing a few specs to fail at the moment

[Aaronontheweb]

Last change cut the number of failed tests down from 11 to 4 - getting there

[Aaronontheweb]

All tests should now pass, except for the ones covered by this change: akkadotnet/akka.net#4002

[Aaronontheweb]

Validated that data saved via Akka.Persistence.MongoDb v1.3.12 can be recovered with the new serialization code, when saved as objects. Going to try testing it with binary serialization next.

[Aaronontheweb]

Looks good using binary serialization as well, using snapshots and event journal. I think this change should be ok for v1.4.0 with some further testing in the field.

[Aaronontheweb]

Merging this in. The same usual suspects tests will fail until I pull in the v1.4.0 bits, which I am doing next.