Add a custom panel for KNX with a group monitor

[farmio]

Proposed change

This adds a custom panel for the KNX integrations which allows to upload a project file and offers a group monitor for bus diagnostics.

More features shall follow later - this was our idea of a MVP for a custom KNX panel.

New requirements

xknxproject - the project data parser https://github.com/XKNX/xknxproject/ knx-frontend - the package containing the panels frontend code https://github.com/XKNX/knx-frontend/

Screenshots

Project information and uploader

Group monitor

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [x] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [x] The code change is tested and works locally.
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• [x] Tests have been added to verify that the new code works.

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• [ ] Documentation added/updated for www.home-assistant.io

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[home-assistant[bot]]

Hey there @julius2342, @marvin-w, mind taking a look at this pull request as it has been labeled with an integration (knx) you are listed as a code owner for? Thanks!

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[elupus]

This is really cool and i'd love to see this in. Is panel_custom is the right way to go? Seems to be very little use of that inside HA. Panels tend to be added directly to the frontend repo.

[farmio]

That was Paulus' suggestion. Afaik it's only used for Insteon currently, and there is an open PR for Dynalite doing the same.

I guess only selected / wider used integrations get to go directly into the frontend repo.

[teharris1]

I think this looks good. A second opinion from somebody with more knowledge of custom_panel would be good.

I built the Insteon side panel and this LGTM.

[marvin-w]

I'm gonna merge this since we have three approving reviews on this. Thank you all!