Simple grouping for Monitor ping + query pings

**Describe your feature request**:
Given a possibility to create a group identified by just it's name and a section where you can manage the belonging domains to such group/collection. Given this the Monitor ping interface would become more like a list of groups and domains as its children. Like:
```
-> Group 1 ---------------------------------------------------- [quick statistics] [open/close arrow]
- example.com
- example.org
- etc.
```
that can be opened or closed.

As a second inclusive feature it would be nice to be also able to add pings against full query paths and give a more descriptive "Name" to each ping, something similar to what I can do in this [android app](https://play.google.com/store/apps/details?id=com.maoux.ismyserveronline):

I'm open to sponsoring this feature request, just let me know to what it would amount.

從 Monitor ping 介面開始，追蹤目前受監控網域和 ping 名稱的表示方式。在實作之前，釐清群組階層、網域管理、完整的查詢路徑支援以及描述性名稱；完成的標準是可以開啟或關閉群組，並且可以使用自訂名稱管理網域 ping 和查詢路徑 ping。

由索引模型根據 Issue 內容生成。