Create a way to track user entity context

[msivri]

Need to a way to track what the user "cares" about given a certain context. The context can possibly be a store's entity id with any related foreign objects such a parent child nested relationship tracking.

This kind of tracking allows the client and server to communicate what context(s) the user is currently in. Benefits are:

• Caching
• Security per context
• SignalR

Possible solution is to use decorators @EntityContext()

Whenever the service sends requests, the context must be involved in the request.

As a rule, each action must be within ONE context. Cross-context actions must be performed separately. i.e Updating a TIRE, should be within the CAR context, the response should not update the CITY context.