refact(action): Make ActionSet behave as a set instead of a list

This switches the implementation of an ActionSet from a slice to a map
to ensure the elements in an ActionSet are unique. This allows for other
packages to perform set operations such as a union or difference without
needing to account for duplicates.

internal/daemon/controller/handlers/authmethods/authmethod_service.go

@@ -64,14 +64,15 @@ const (
 var (
 	// IdActions contains the set of actions that can be performed on
 	// individual resources
+	// This will be set in init functions in files for each subtype in this package.
 	IdActions = make(map[globals.Subtype]action.ActionSet)
 
 	// CollectionActions contains the set of actions that can be performed on
 	// this collection
-	CollectionActions = action.ActionSet{
+	CollectionActions = action.NewActionSet(
 		action.Create,
 		action.List,
-	}
+	)
 
 	collectionTypeMap = map[resource.Type]action.ActionSet{
 		resource.Account:      accounts.CollectionActions,