tests: Copy stdlib tests from Kotlin/JVM

This patch copies Kotlin/JVM stdlib tests (libraries/stdlib/test)
excepting ones with explicit java dependencies. It also transforms
the tests to use them as box-tests.

backend.native/tests/external/stdlib/collections/CollectionTest/subscript.kt

@@ -0,0 +1,25 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+fun box() {
+    val list = arrayListOf("foo", "bar")
+    assertEquals("foo", list[0])
+    assertEquals("bar", list[1])
+
+    // lists throw an exception if out of range
+    assertFails {
+        val outOfBounds = list[2]
+    }
+
+    // lets try update the list
+    list[0] = "new"
+    list[1] = "thing"
+
+    // lists don't allow you to set past the end of the list
+    assertFails {
+        list[2] = "works"
+    }
+
+    list.add("works")
+    assertEquals(listOf("new", "thing", "works"), list)
+}