Update examples to fit new properties panel architecture

[pinussilvestrus]

trafficstars

What should we do?

Once we release the v1.0.0 version of the new Properties Panel, we shall also update the existing examples:

• [x] #145
• [x] Update /properties-panel-extension
• [x] #148
• [ ] Feature the following use-cases
  • [ ] Replace individual form components
  • [ ] Add additional form components

We already started with a minimal example inside the properties-panel-next-example branch. To avoid confusion with the old, but still available properties panel integration, let's follow up with the update once we reach the point of releasing the whole properties panel as [email protected].

Why should we do it?

Showcase the usage of the new properties panel.

[pinussilvestrus]

One new example to show case the capabilities of the new architecture (e.g. async data fetching)

Some examples we could consider when working on this

• https://github.com/bpmn-io/properties-panel-async-example
• https://github.com/bpmn-io/properties-panel-persist-layout-example

/cc @barmac

[nikku]

This is mostly done (all examples use new architecture).