VMess AEAD based packet length

(cherry picked from commit 08221600082a79376bdc262f2ffec1a3129ae98d)

infra/conf/vmess.go

@@ -15,9 +15,10 @@ import (
 )
 
 type VMessAccount struct {
-	ID       string `json:"id"`
-	AlterIds uint16 `json:"alterId"`
-	Security string `json:"security"`
+	ID          string `json:"id"`
+	AlterIds    uint16 `json:"alterId"`
+	Security    string `json:"security"`
+	Experiments string `json:"experiments"`
 }
 
 // Build implements Buildable
@@ -43,6 +44,7 @@ func (a *VMessAccount) Build() *vmess.Account {
 		SecuritySettings: &protocol.SecurityConfig{
 			Type: st,
 		},
+		TestsEnabled: a.Experiments,
 	}
 }