add a quic.Config option to set the handshake timeout

interface.go

@@ -71,6 +71,10 @@ type Config struct {
 	// This saves 8 bytes in the Public Header in every packet. However, if the IP address of the server changes, the connection cannot be migrated.
 	// Currently only valid for the client.
 	RequestConnectionIDTruncation bool
+	// HandshakeTimeout is the maximum duration that the cryptographic handshake may take.
+	// If the timeout is exceeded, the connection is closed.
+	// If this value is zero, the timeout is set to 10 seconds.
+	HandshakeTimeout time.Duration
 	// AcceptSTK determines if an STK is accepted.
 	// It is called with stk = nil if the client didn't send an STK.
 	// If not set, it verifies that the address matches, and that the STK was issued within the last 24 hours