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.

Comienza con la interfaz de ping de Monitor y rastrea cómo se representan actualmente los dominios monitorizados y los nombres de ping. Aclara la jerarquía de grupos, la gestión de dominios, la compatibilidad completa con rutas de consulta y los nombres descriptivos antes de la implementación; se considera terminado cuando se puedan abrir o cerrar grupos y gestionar tanto los pings de dominio como los de rutas de consulta con nombres personalizados.

Escrito por el modelo de indexación a partir del texto del issue.