[feat] UI for plugin

[agracey]

Is your feature request related to a problem? Please describe. I'm looking at building a "virtual device" plugin to synchronize states and present to mqtt as a single device (my switches only allow the lifeline association, which is annoying as the signal path is long giving time for race conditions).

The problem is that this would require some external or custom UI.

Describe the solution you'd like I'd like a way to render buttons and forms in the main UI. Preferably on it's own tab or maybe in a accordion group under settings.

I would probably also need a way to read/write to the main config object?

Describe alternatives you've considered This could be driven via come external mechanism but this seems clunky.

[robertsLando]

I thought about this, anyway I have no idea how I could implement such feature as the application is a SPA and everything is built using webpack :(

[agracey]

There are two ways that I know to build this. Allow for a plugin to export a jsonschema for config then render that in the UI, or allow for the plugin to render it's own UI components in an iframe

If this is something there is interest in, I could likely submit a PR once I have enough time to do so.

[robertsLando]

@agracey Feel free to submit a PR so, I think the iframe could be an option