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/golang.org/x/sys/unix/endian_little.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
+//go:build 386 || amd64 || amd64p32 || alpha || arm || arm64 || mipsle || mips64le || mips64p32le || nios2 || ppc64le || riscv || riscv64 || sh
 // +build 386 amd64 amd64p32 alpha arm arm64 mipsle mips64le mips64p32le nios2 ppc64le riscv riscv64 sh
 
 package unix