Add tasks for all the new languages

Task/Apply-a-callback-to-an-array/Sparkling/apply-a-callback-to-an-array-1.sparkling

@@ -0,0 +1,4 @@
+let numbers = { 1, 2, 3, 4 };
+foreach(numbers, function(idx, num) {
+    print(num);
+});

Task/Apply-a-callback-to-an-array/Sparkling/apply-a-callback-to-an-array-2.sparkling

@@ -0,0 +1,4 @@
+let dict = { "foo": 42, "bar": 13, "baz": 37 };
+let doubled = map(dict, function(key, val) {
+    return val * 2;
+});