[rocprofiler-systems] Add SIGKILL delay option (#2384)

## Motivation

When profiling multi-process applications where a parent process sends SIGKILL to child processes, the termination can occur before the profiler has a chance to flush collected data. This PR introduces a configurable delay before SIGKILL signals are forwarded, allowing profiling data to be captured before process termination. This is workaround.

## Technical Details

- Added new configuration setting `ROCPROFSYS_KILL_DELAY` (default: 0 seconds) to specify a delay before SIGKILL signals are forwarded to other processes
- Implemented `kill_gotcha` component that intercepts the `kill()` system call
- The gotcha only delays SIGKILL signals sent to external processes (pid > 0 and not self)
- Integrated `kill_gotcha_t` into the `preinit_bundle_t` for early initialization

projects/rocprofiler-systems/source/lib/core/config.cpp

@@ -838,6 +838,18 @@ configure_settings(bool _init)
         "starting with '_' or containing '::_M'.",
         true, "causal", "analysis", "advanced");
 
+    ROCPROFSYS_CONFIG_SETTING(int, "ROCPROFSYS_KILL_DELAY",
+                              "Delay (in seconds) before terminating the process "
+                              "after a kill signal is received.",
+                              0, "process", "advanced");
+
+    auto kill_delay_config = _config->find("ROCPROFSYS_KILL_DELAY")->second;
+    auto kill_delay_value  = kill_delay_config->get<int>().second;
+    if(kill_delay_value < 0)
+    {
+        kill_delay_config->set(0);
+    }
+
     // set the defaults
     _config->get_flamegraph_output()     = false;
     _config->get_ctest_notes()           = false;
@@ -2556,6 +2568,13 @@ get_caching_perfetto()
     return static_cast<tim::tsettings<bool>&>(*_v).get();
 }
 
+int
+get_kill_delay()
+{
+    static auto _v = get_config()->find("ROCPROFSYS_KILL_DELAY");
+    return static_cast<tim::tsettings<int>&>(*_v->second).get();
+}
+
 tmp_file::tmp_file(std::string _v)
 : filename{ std::move(_v) }
 {}