[action][ci] add cppcheck new feature

'--check-level=exhaustive'
这个选项可以更深入的在分支中检测，但是会耗时比较久一些。

tools/ci/cpp_check.py

@@ -33,6 +33,7 @@ class CPPCheck:
                     '-I thread/components/finsh',
                     # it's okay because CI will do the real compilation to check this
                     '--suppress=syntaxError',
+                    '--check-level=exhaustive',
                     '--enable=warning',
                     'performance',
                     'portability',