Adds a DurableOrchestrationContext class declaration exported from the root of the package that the DurableOrchestrationContext class implements. This is the type of the context.df object in orchestrations.
Converts DurableEntityContext type into an interface, and also exports it from the root of the package. This is the type of the context.df object in entity functions
Part of #416:
DurableOrchestrationContextclass declaration exported from the root of the package that theDurableOrchestrationContextclass implements. This is the type of thecontext.dfobject in orchestrations.DurableEntityContexttype into an interface, and also exports it from the root of the package. This is the type of thecontext.dfobject in entity functions