Add tests for kotlin language support in the expressions dsl

idea/testData/debugger/sequence/dsl/mapConvertToArray.out

@@ -0,0 +1,13 @@
+var resultArray: kotlin.Array<kotlin.Any?> = arrayOfNulls<kotlin.Any>(0)
+run {
+  val size: kotlin.Int = map.size
+  val keys: kotlin.IntArray = kotlin.IntArray(size)
+  val values: kotlin.Array<kotlin.Any?> = kotlin.arrayOfNulls(size)
+  var i: kotlin.Int = 0
+  for (key in map.keys) {
+    keys[i] = key
+    values[i] = map[key]
+    i++
+  }
+  resultArray = kotlin.arrayOf<kotlin.Any?>(keys, values)
+}