Request: KEA DHCP add description field to "Subnets" in Subnet tab

[Snobs76]

• [ x ] I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
• [ x ] I am convinced that my issue is new after having checked both open and closed issues at https://github.com/opnsense/core/issues?q=is%3Aissue

Describe the solution you like

I would like to have any possiblity for a description at the "Subnet" Tab for the networks, maybe from the Interface itself or a field with any kind of description