refactor：优化菜单排序

[zeje]

优化菜单排序

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

caizz seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[zhou-hao]

1. 什么场景下需要这样排序
2. 封装一个支持分组排序的工具应该更合适? SortUtils.groupingSort( list, MenuEntity::getOwner ) 这样?

[zeje]

角色分配权限界面，菜单数据有多个owner时（如 iot，jetlinks），自定义的owner的菜单，跟系统原有iot的菜单，交错在了一起。
通用查询，使用owner排序，再按照sortIndex。这样的话，iot 在前面，jetlinks在后面。
假如说我想jetlinks在前面，按照我push的代码，可以做到这个效果。只要把jetlinks的最小的sortIndex设置得比iot得最小的sortIndex小便可。