For create customized WebtransportSession #195

[chrislearn]

[chrislearn]

Simply put, I want to reuse types other than WebTransportSession and create my own custom WebTransportSession to meet specific business requirements. For example, the current WebTransportSession is hard-coded with Request<()>, but in my specific case, I may have a custom Request object. I may even need to handle whether it is a WEB_TRANSPORT request and error handling outside of WebTransportSession.