Created Cancel call in webmvc

# Conflicts:
#	eShopOnContainers-ServicesAndWebApps.sln
#	src/Services/Basket/Basket.API/Controllers/BasketController.cs
#	src/Services/Basket/Basket.API/Startup.cs

# Conflicts:
#	eShopOnContainers-ServicesAndWebApps.sln

Because of the using blocks, these one line methods need the async
modifier so that the that async state machiner is created. Otherwise, if
the method does not complete synchronously, the connection is closed
before the database has returned its results.

The methods that return collections should return
Task<IEnumerable<dynamic>> not Task<dynamic>

Checkout HTTP entrypoint in Basket API

Instead to register EventHandlers we register Func<EventHandlers> which solves scope problems (having transient/scoped objects owned by singletons)

The methods that return collections should return
Task<IEnumerable<dynamic>> not Task<dynamic>

Created basic structure for order process saga