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/first.kt

@@ -0,0 +1,10 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+fun box() {
+    val data = listOf("foo", "bar")
+    assertEquals("foo", data.first())
+    assertEquals(15, listOf(15, 19, 20, 25).first())
+    assertEquals('a', listOf('a').first())
+    assertFails { arrayListOf<Int>().first() }
+}