start the process of making sync objects an extension

projects/extensions/synchronization/fence/gryphn_fence.h

@@ -0,0 +1,20 @@
+#pragma once
+#include <utils/gryphn_bool.h>
+#include "utils/gryphn_error_code.h"
+#include "utils/lists/gryphn_array_list.h"
+#include "gryphn_handles.h"
+
+#ifdef GN_REVEAL_IMPL
+struct gnFence_t {
+    struct gnPlatformFence_t* fence;
+    gnOutputDeviceHandle device;
+    gnBool signaled;
+};
+#endif
+GN_ARRAY_LIST(gnFence);
+
+gnReturnCode gnCreateFence(gnFenceHandle* fence, gnOutputDeviceHandle device);
+void gnSignalFence(gnFenceHandle fence);
+void gnWaitForFence(gnFenceHandle fence, uint64_t timeout);
+void gnResetFence(gnFenceHandle fence);
+void gnDestroyFence(gnFenceHandle fence);