Add possibility to group states in webserver

**Describe the problem you have/What new integration you would like**

I have multiple states and i would like to group them logically in the webserver. Currently the order is random.

**Please describe your use case for this integration and alternatives you've tried:**

If states can be grouped logically together then it's easier to keep an overview over the states

**Additional context**

Maybe an additional property on the item (e.g. ``group``) or an additional field on the webserver ``groups`` which is a list which contains lists of ids.

The request concerns how states are ordered and displayed in the webserver; start by locating the existing state listing and reviewing its current ordering behavior. The feature would be done when states can be grouped logically and the grouping is consistently visible, but the grouping model and expected interface still need clarification.

Written by the indexing model from the issue text.