Update TrainInfo and BinaryPushStateChanged atoms

Add trainName string field to TrainInfo atom
Add status enum to TrainInfo atom
Add additional states to BinaryPushStateChanged.State

Bug: 124397500
Bug: 126787525
Bug: 126780868
Test: add/edit tests in StorageManagerTest to verify new
serialization/deserialization logic

Change-Id: I7bf4cd3b3cb4fdb8b1ebe51a602cfde9fdace6e1