Adding Async output for API Tracing

If rocprofiler_set_api_trace_sync_callback is not called by the API client then it will be automatically saved in the buffer and it will be in async to the user to see the API trace data, sample for async api tracing is added to samples/tracer

Change-Id: I01266a12b0eec172fdcffd7f04c89c2fe96174bb


[ROCm/rocprofiler commit: 29b25a3ef5]

projects/rocprofiler/src/core/session/session.cpp

@@ -131,7 +131,9 @@ void Session::Start() {
           GetFilter(GetFilterIdWithKind(ROCPROFILER_API_TRACE))->GetTraceData();
       if (!tracer_started_.load(std::memory_order_release)) {
         tracer_ = new tracer::Tracer(
-            session_id_, GetFilter(GetFilterIdWithKind(ROCPROFILER_API_TRACE))->GetCallback(),
+            session_id_, (GetFilter(
+              GetFilterIdWithKind(ROCPROFILER_API_TRACE))->HasCallback() ? GetFilter(
+                GetFilterIdWithKind(ROCPROFILER_API_TRACE))->GetCallback() : nullptr),
             GetFilter(GetFilterIdWithKind(ROCPROFILER_API_TRACE))->GetBufferId(), domains);
         tracer_started_.exchange(true, std::memory_order_release);
       }