fix(android): allow node to clear event loop

As the iterate function here is sync with large numbers of files (say a hyperloop project) we could
run into an issue where node hasn't had a chance to clear the event loop and we'd bog it down with
the constant calls. By putting the test callback into a nextTick call it allows node the chance to
clear the event loop before we choke it

Ref TIMOB-28090

android/cli/commands/_build.js

@@ -2494,7 +2494,7 @@ AndroidBuilder.prototype.copyResources = function copyResources(next) {
 
 		async.whilst(
 			function (cb) {
-				return cb(null, files.length);
+				process.nextTick(() => cb(null, files.length));
 			},
 
 			function (next) {