ds/asio/resource: print number of flying exceptions in destructor

To help investigations

src/ds/asio/resource.cpp

@@ -103,7 +103,7 @@ ResourceBase::ResourceBase(Private, ResourceContext& context, std::string&& path
 }
 
 ResourceBase::~ResourceBase() {
-  DS_INFO_ENTER(path());
+  DS_INFO_ENTER(path(), std::uncaught_exceptions());
   if (!m_path.empty()) {
     // root resource is not synchronized and not in resources
     assertSynchronized();