feat: Add costs field to URLTestOutboundOptions and update NewURLTestGroup signature

option/group.go

@@ -10,6 +10,7 @@ type SelectorOutboundOptions struct {
 
 type URLTestOutboundOptions struct {
 	Outbounds                 []string           `json:"outbounds"`
+	Costs                     map[string]uint16  `json:"costs,omitempty"`
 	URL                       string             `json:"url,omitempty"`
 	Interval                  badoption.Duration `json:"interval,omitempty"`
 	Tolerance                 uint16             `json:"tolerance,omitempty"`