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/toStringTest.kt

@@ -0,0 +1,7 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+fun box() {
+    // we need toString() inside pattern because of KT-8666
+    assertEquals("[1, a, null, ${Long.MAX_VALUE.toString()}]", listOf(1, "a", null, Long.MAX_VALUE).toString())
+}