test: add unit tests for common utilities from PR #1249 (#2237)

* test: add unit tests for common utilities from PR #1249

* incorporate review comments specific to tests formatting

* use filesystem API instead of std::system for safer cleanup

* Add ghc/filesystem submodule v1.5.14 for portable C++17 filesystem support

* fix: add cmake/GhcFilesystem.cmake for CI submodule auto-checkout

* incorporate review comment

* incorporate review comment

.gitmodules

@@ -95,3 +95,6 @@
 [submodule "projects/rocprofiler-systems/external/googletest"]
 	path = projects/rocprofiler-systems/external/googletest
 	url = https://github.com/google/googletest.git
+[submodule "projects/rocprofiler-systems/external/filesystem"]
+	path = projects/rocprofiler-systems/external/filesystem
+	url = https://github.com/gulrak/filesystem.git