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/SetOperationsTest/intersect.kt

@@ -0,0 +1,9 @@
+import kotlin.test.*
+
+
+fun box() {
+    assertTrue(listOf(1, 3).intersect(listOf(5)).none())
+    assertEquals(listOf(5), listOf(1, 3, 5).intersect(listOf(5)).toList())
+    assertEquals(listOf(1, 3, 5), listOf(1, 3, 5).intersect(listOf(1, 3, 5)).toList())
+    assertTrue(listOf<Int>().intersect(listOf(1)).none())
+}