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/minWith.kt

@@ -0,0 +1,10 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+val STRING_CASE_INSENSITIVE_ORDER: Comparator<String> = compareBy { it: String -> it.toUpperCase() }.thenBy { it.toLowerCase() }.thenBy { it }
+fun box() {
+    expect(null, { listOf<Int>().minWith(naturalOrder()) })
+    expect(1, { listOf(1).minWith(naturalOrder()) })
+    expect("a", { listOf("a", "B").minWith(STRING_CASE_INSENSITIVE_ORDER) })
+    expect("a", { listOf("a", "B").asSequence().minWith(STRING_CASE_INSENSITIVE_ORDER) })
+}