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/foldWithNonCommutativeOperation.kt

@@ -0,0 +1,9 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+fun box() {
+    expect(1) {
+        val numbers = listOf(1, 2, 3)
+        numbers.fold(7) { a, b -> a - b }
+    }
+}