Idea: discover typed api client registrations and provide them as holes in the CEs

[jkone27]

it could be interesting to provide typed api registration when typed api clients are provided server side, e.g.

let webAppFactory = 
    new TestClient<Web.Sample.Program>() 
    |> fun x -> x {
        API<Web.Sample.Clients.ClientOne> {
             // typechecks on return type from api client methods
             _.GetName {| Name = "Peter" |} 
             _.GetAge {| Age = 100 |}
         }
    }
    |> _.GetFactory()

or some alternative form