added httplib(header only lib) client as simple client to fixing cras…

# Crash on adding a new subscription group by link You can check it. It crashes when adding a subscription group (fact: when it is going to download body by request GET). The crash in the file (`HTTPRequestHelper.cpp`), line: ```auto _reply = access manager.get(request);``` When using GCC it has a crash (I didn't spend time on finding exactly why, it took too much time ..., so I just fixed it ASAP) , fixed by using a header-only HTTP client(tested in Ubuntu 20,22, GCC compiler)