Add scope field to access token

Author: harryzcy

models/auth/token.go

@@ -59,6 +59,7 @@ type AccessToken struct {
 	TokenHash      string `xorm:"UNIQUE"` // sha256 of token
 	TokenSalt      string
 	TokenLastEight string `xorm:"token_last_eight"`
+	Scope          string
 
 	CreatedUnix       timeutil.TimeStamp `xorm:"INDEX created"`
 	UpdatedUnix       timeutil.TimeStamp `xorm:"INDEX updated"`