[K/N] Move kotlin.native.internal.Debugging into kotlin.native.runtime

As a part of efforts to stabilize Native stdlib #KT-55765.

kotlin-native/backend.native/tests/runtime/exceptions/custom_hook.kt

@@ -2,12 +2,13 @@
  * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-@file:OptIn(FreezingIsDeprecated::class, ExperimentalStdlibApi::class)
+@file:OptIn(FreezingIsDeprecated::class, ExperimentalStdlibApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
 
 import kotlin.test.*
 
 import kotlin.native.concurrent.*
 import kotlin.native.internal.*
+import kotlin.native.runtime.Debugging
 
 fun mainLegacyMM() {
     val wrong = "wrong"