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/go.mod

@@ -0,0 +1,20 @@
+module github.com/lucas-clemente/quic-go
+
+go 1.15
+
+require (
+	github.com/cheekybits/genny v1.0.0
+	github.com/francoispqt/gojay v1.2.13
+	github.com/golang/mock v1.6.0
+	github.com/marten-seemann/qpack v0.2.1
+	github.com/marten-seemann/qtls-go1-15 v0.1.4
+	github.com/marten-seemann/qtls-go1-16 v0.1.3
+	github.com/marten-seemann/qtls-go1-17 v0.1.0-beta.1.2
+	github.com/onsi/ginkgo v1.14.0
+	github.com/onsi/gomega v1.10.1
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+)