Provide unzip method for Iterables, Arrays and Sequences of pairs.

#KT-5793 Fixed

libraries/stdlib/test/collections/CollectionTest.kt

@@ -621,6 +621,19 @@ class CollectionTest {
         assertEquals(e, 5)
     }
 
+    test fun unzipList() {
+        val list = listOf(1 to 'a', 2 to 'b', 3 to 'c')
+        val (ints, chars) = list.unzip()
+        assertEquals(listOf(1, 2, 3), ints)
+        assertEquals(listOf('a', 'b', 'c'), chars)
+    }
+
+    test fun unzipArray() {
+        val array = arrayOf(1 to 'a', 2 to 'b', 3 to 'c')
+        val (ints, chars) = array.unzip()
+        assertEquals(listOf(1, 2, 3), ints)
+        assertEquals(listOf('a', 'b', 'c'), chars)
+    }
 
     test fun specialLists() {
         compare(arrayListOf<Int>(), listOf<Int>()) { listBehavior() }