[rocprofiler-systems] Implement GTest/GMock integration for unit testing (#1777)

* googletest project set up

---------

Co-authored-by: Aleksandar Djordjevic <adjordje@amd.com>
Co-authored-by: Milan Radosavljevic <milan.radosavljevic@amd.com>

projects/rocprofiler-systems/source/CMakeLists.txt

@@ -13,6 +13,10 @@ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}
 add_subdirectory(lib)
 add_subdirectory(bin)
 
+if(ROCPROFSYS_BUILD_TESTING)
+    add_subdirectory(tests)
+endif()
+
 if(ROCPROFSYS_USE_PYTHON)
     add_subdirectory(python)
 endif()