Show more info on global variables in binding editor

[Janpot]

From #309

DX: In the "Bind a property" view, it would be interesting to know the nature of the global variable. Is it a component or an API state? It could help more quickly navigate what's available. We might even want to group them.

Some of the features we could consider:

• group the scope variables
• make them filterable with a searchbox
• label/color them (e.g. this is a component, this is a query)
• add longer form descriptions (perhaps in tooltips), links to documentation
• show type information
• add copy path to clipboard so it can be pasted in the editor
• add longer form descriptions to the nested properties
• ...?

[Janpot]

ref #1096 (comment)