store the RTT in the token, not in the session ticket (#5065)

* remove RTT from session ticket

* save RTT in token

* use mus as rtt unit in token

* move RTT from session state to token on client side

* Rename the rtt variables

Co-authored-by: Marten Seemann <martenseemann@gmail.com>

* Update internal/handshake/token_generator.go

Co-authored-by: Marten Seemann <martenseemann@gmail.com>

* Update token_generator.go

* Update connection.go

* Update token_generator.go

* correct slice  access in fuzz.go

* rearrange connection constructor parameters

---------

Co-authored-by: Marten Seemann <martenseemann@gmail.com>

interface.go

@@ -30,6 +30,7 @@ const (
 // It can be used to skip address validation on future connection attempts.
 type ClientToken struct {
 	data []byte
+	rtt  time.Duration
 }
 
 type TokenStore interface {