Sampling Tweaks: disable sampling itimer (#95)

* tweak starting sampling on main thread

- rename omnitrace::common::utility to omnitrace::common::path
- tracing::thread_init_sampling does not start sampling on main thread

* Cancel sampling itimers + timemory submodule update

- updates timemory submodule with support for cancelling itimer and SIGRTMIN through SIGRTMAX

[ROCm/rocprofiler-systems commit: 400e5078ed]

projects/rocprofiler-systems/source/lib/omnitrace/library.cpp

@@ -78,6 +78,8 @@ auto
 ensure_finalization(bool _static_init = false)
 {
     (void) threading::get_id();
+    (void) utility::get_thread_index();
+
     if(!_static_init)
     {
         OMNITRACE_DEBUG_F("\n");