Add wall clock analysis (#184)

* Add combined on-CPU and off-CPU profiler script

- Implemented a new profiling tool that captures both on-CPU and off-CPU activity for a specified process.
- The script runs 'oncputime' and 'offcputime' tools simultaneously and combines their results into a unified flamegraph.
- Added functionality to discover threads and profile them individually if the application is multi-threaded.
- Included error handling for tool execution and output processing.
- Created methods for generating flamegraph data and SVG visualizations.
- Added command-line argument parsing for user-defined profiling parameters.
- Implemented detailed analysis reports for both individual threads and overall profiling results.

* feat: integrate blazesym v0.2.0 for improved symbol resolution and add test program for memory leak detection

* docs: update README to enhance wall clock profiling tutorial with detailed explanations and examples

* feat: add wallclock-profiler tests to CI workflow for tool validation

* fix: rename combined_profiler.py to wallclock_profiler.py in test scripts and usage examples

src/32-wallclock-profiler/.gitignore

@@ -0,0 +1,25 @@
+/.output
+/bootstrap
+/profile
+/offcputime
+/oncputime
+res.txt
+*.o
+oncpu.txt
+offcpu.txt
+FlameGraph
+pmumon
+test_combined
+pmumon_advanced
+/demo_results.svg
+demo_results.folded
+test_program
+combined_profile_pid*.svg
+combined_profile_pid*.folded
+combined_profile_pid*.txt
+combined_flamegraph.pl
+multithread_combined_profile_pid*
+demo_results_single_thread_analysis.txt
+test_multithread
+perf.data*
+double_bandwidth