[Benchmark] Benchmark cpp for YOLOv5 (#1260)

* add GPL lisence

* add GPL-3.0 lisence

* add GPL-3.0 lisence

* add GPL-3.0 lisence

* support yolov8

* add pybind for yolov8

* add yolov8 readme

* add cpp benchmark

* add cpu and gpu mem

* public part split

* add runtime mode

* fixed bugs

* add cpu_thread_nums

* deal with comments

* deal with comments

* deal with comments

* rm useless code

* add FASTDEPLOY_DECL

* add FASTDEPLOY_DECL

* fixed for windows

* mv rss to pss

* mv rss to pss

* Update utils.cc

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Co-authored-by: DefTruth <31974251+DefTruth@users.noreply.github.com>

benchmark/cpp/CMakeLists.txt

@@ -0,0 +1,17 @@
+PROJECT(infer_demo C CXX)
+CMAKE_MINIMUM_REQUIRED (VERSION 3.10)
+
+# specify the decompress directory of FastDeploy SDK
+option(FASTDEPLOY_INSTALL_DIR "Path of downloaded fastdeploy sdk.")
+include(${FASTDEPLOY_INSTALL_DIR}/utils/gflags.cmake)
+include(${FASTDEPLOY_INSTALL_DIR}/FastDeploy.cmake)
+
+include_directories(${FASTDEPLOY_INCS})
+
+add_executable(benchmark_yolov5 ${PROJECT_SOURCE_DIR}/benchmark_yolov5.cc)
+
+if(UNIX AND (NOT APPLE) AND (NOT ANDROID))
+  target_link_libraries(benchmark_yolov5 ${FASTDEPLOY_LIBS} gflags pthread)
+else()
+  target_link_libraries(benchmark_yolov5 ${FASTDEPLOY_LIBS} gflags)
+endif()