Misc API cleanup and consistency fixes (#1023)

- ROCPROFILER_API after function
- use rocprofiler_tracing_operation_t in lieu of uint32_t where appropriate
- rocprofiler_tracing_operation_t is not int32_t typedef (formerly uint32_t)
- use const T* instead of T* where appropriate

[ROCm/rocprofiler-sdk commit: bb25376480]

projects/rocprofiler-sdk/tests/thread-trace/common.hpp

@@ -121,6 +121,5 @@ callbacks_init();
 void
 callbacks_fini();
 
-};  // namespace Callbacks
-
-};  // namespace ATTTest
+}  // namespace Callbacks
+}  // namespace ATTTest