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/decomposeIntArray.kt

@@ -0,0 +1,11 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+fun box() {
+    val (a, b, c, d, e) = intArrayOf(1, 2, 3, 4, 5)
+    assertEquals(a, 1)
+    assertEquals(b, 2)
+    assertEquals(c, 3)
+    assertEquals(d, 4)
+    assertEquals(e, 5)
+}