convert .length on arrays to .size

tests/testData/ast/issues/file/arrayLength.jav

@@ -0,0 +1,5 @@
+class Test {
+  public static int foo(String[] args) {
+    return args.length;
+  }
+}

tests/testData/ast/issues/file/arrayLength.kt

@@ -0,0 +1,7 @@
+open class Test() {
+class object {
+public open fun foo(args : Array<String?>?) : Int {
+return args?.size!!
+}
+}
+}