[K/N] Make GC.collect wait for finalizers being run

^KT-50713

Merge-request: KT-MR-5404
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/runtime/src/main/cpp/Memory.h

@@ -520,6 +520,9 @@ private:
 
 extern const bool kSupportsMultipleMutators;
 
+void StartFinalizerThreadIfNeeded() noexcept;
+bool FinalizersThreadIsRunning() noexcept;
+
 } // namespace kotlin
 
 #endif // RUNTIME_MEMORY_H