Proxy chunked encoding support, bug fixes to cache, nodejs, aio, cgroup and namespace

• [Security] Fix chunked encoding + proxy related issues (thanks to @Skad0sh @ma1f0y @sayoojbkumar)
• [Feature] Add request body chunked encoding support for proxy backend
• [Bugfix] Fix excessive cache missing due to varying on cookie.
• [Bugfix] Make nodejs helper script compatible with older nodejs versions.
• [Bugfix] Minor fixes to namespace and cgroup support.
• [Bugfix] Update lsquic to v4.0.8
• [Bugfix] Fix crash in AIO code.