Add JSSDK context method functionality (#828)

* Add JSSDK context method functionality

* 善JSSDK上下文方法，并添加测试文件

* feat: 完善JSSDK上下文方法，保证协程安全，并添加测试文件

* 修改 import 包分组处理

* feat: 修改测试文件中 fmt.Print -> t.Log

* 删除空行

credential/js_ticket.go

@@ -1,7 +1,15 @@
 package credential
 
+import context2 "context"
+
 // JsTicketHandle js ticket获取
 type JsTicketHandle interface {
 	// GetTicket 获取ticket
 	GetTicket(accessToken string) (ticket string, err error)
 }
+
+// JsTicketContextHandle js ticket获取
+type JsTicketContextHandle interface {
+	JsTicketHandle
+	GetTicketContext(ctx context2.Context, accessToken string) (ticket string, err error)
+}