Implement RawDataWorker

[tejaede]

RawDataWorker is the root service in a Montage Data stack operating on the server. Like all root services, it's primary function is to route requests to RawDataServices. However, RawDataWorker is unique from other DataServices in a couple of ways:

1. It traffics purely in RawDataOperation objects.
2. RawDataServices are initialized lazily. Specifically, a RawDataService is only initialized once a RawDataOperation arrives that the RawDataService must handle.

• Initialize RawDataServices on the fly
• Receive RawDataOperation and route it to RawDataService
• Return RawDataOperation on action completion
• Implement RawDataWorker with finalized RawDataOperation