Add group management to the ZHA config panel

[dmulcahey]

This PR adds a UI for managing ZHA Zigbee groups. It supports the basic CRUD actions. I'll split this into separate PR's if it is preferred. Here are some screen shots that outline the functionality:

Manage groups added to main ZHA config panel:

Groups View:

Selected Groups details:

Create Group view:

Device details dialog in group view:

I wanted to get this open to gather feedback as I have had this in this state for a few weeks now. I am thinking about how to break this up if that's preferred. I am thinking I could open the following PR's:

• add the manage groups button to the main screen and the groups view
• add the individual groups details view
• add editing of individual group (including delete)
• add group creation

Let me know if that makes sense to do or not.

[bramkragten]

It would help reviewing if it would be in smaller blocks, so that would be great. Make sure the separate blocks are functional without the others, so we can merge (and maybe release) them one by one.

[dmulcahey]

Cool. Does the plan outlined at the bottom of the post make sense? If so, I’ll try to do that tonight.

I’m also gonna leave this open to aid myself while splitting this up.

[bramkragten]

I think so, I'm not really familiar enough with how groups work for zigbee.

[dmulcahey]

First PR opened supporting only viewing of existing groups: #4365