RFC 8441 and RFC 9220

[ankurpathak]

Add support for RFC 8441 and RFC 9220 to support WebSockets on Http2 and Http3

[lachlan-roberts]

I don't believe any API changes are required to support WebSocket over HTTP/2 and HTTP/3.

Although there is some wording in the specification and the javadoc which assume that a WebSocket upgrade request must use a GET http-method which is only true for HTTP/1.1, when using HTTP/2 or HTTP/3 the upgrade request will use the CONNECT method.