TUN-4597: Add a QUIC server skeleton

- Added a QUIC server to accept streams
- Unit test for this server also tests ALPN
- Temporary echo capability for HTTP ConnectionType

vendor/github.com/lucas-clemente/quic-go/README.md

@@ -0,0 +1,49 @@
+# A QUIC implementation in pure Go
+
+<img src="docs/quic.png" width=303 height=124>
+
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/lucas-clemente/quic-go)](https://pkg.go.dev/github.com/lucas-clemente/quic-go)
+[![Travis Build Status](https://img.shields.io/travis/lucas-clemente/quic-go/master.svg?style=flat-square&label=Travis+build)](https://travis-ci.org/lucas-clemente/quic-go)
+[![CircleCI Build Status](https://img.shields.io/circleci/project/github/lucas-clemente/quic-go.svg?style=flat-square&label=CircleCI+build)](https://circleci.com/gh/lucas-clemente/quic-go)
+[![Windows Build Status](https://img.shields.io/appveyor/ci/lucas-clemente/quic-go/master.svg?style=flat-square&label=windows+build)](https://ci.appveyor.com/project/lucas-clemente/quic-go/branch/master)
+[![Code Coverage](https://img.shields.io/codecov/c/github/lucas-clemente/quic-go/master.svg?style=flat-square)](https://codecov.io/gh/lucas-clemente/quic-go/)
+
+quic-go is an implementation of the [QUIC protocol, RFC 9000](https://datatracker.ietf.org/doc/html/rfc9000) protocol in Go.
+In addition to RFC 9000, it currently implements the [IETF QUIC draft-29](https://tools.ietf.org/html/draft-ietf-quic-transport-29), [draft-32](https://tools.ietf.org/html/draft-ietf-quic-transport-32) and [draft-34](https://tools.ietf.org/html/draft-ietf-quic-transport-34). Support for draft versions will be eventually be dropped, as these are phased out of the ecosystem.
+
+## Guides
+
+*We currently support Go 1.15.x, Go 1.16.x and Go 1.17 Beta 1, with [Go modules](https://github.com/golang/go/wiki/Modules) support enabled.*
+
+Running tests:
+
+    go test ./...
+
+### QUIC without HTTP/3
+
+Take a look at [this echo example](example/echo/echo.go).
+
+## Usage
+
+### As a server
+
+See the [example server](example/main.go). Starting a QUIC server is very similar to the standard lib http in go:
+
+```go
+http.Handle("/", http.FileServer(http.Dir(wwwDir)))
+http3.ListenAndServeQUIC("localhost:4242", "/path/to/cert/chain.pem", "/path/to/privkey.pem", nil)
+```
+
+### As a client
+
+See the [example client](example/client/main.go). Use a `http3.RoundTripper` as a `Transport` in a `http.Client`.
+
+```go
+http.Client{
+  Transport: &http3.RoundTripper{},
+}
+```
+
+## Contributing
+
+We are always happy to welcome new contributors! We have a number of self-contained issues that are suitable for first-time contributors, they are tagged with [help wanted](https://github.com/lucas-clemente/quic-go/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22). If you have any questions, please feel free to reach out by opening an issue or leaving a comment.