The macro used to create a new instance of a TypedAmGroup which is an Active Message Group that can only include AMs of a specific type (but this type can return data).
Data is returned in the same order as the AMs were added
(You can think of this as similar to Vec<T>)
This macro which expects two parameters, the first being the type (name) of the AM and the second being a reference to a lamellar team.