[things] Add ability to retrieve all things

[janwo]

Dear community,

in order to analyze all things in my scripts, I need something like things.getAll().

See https://www.openhab.org/javadoc/latest/org/openhab/core/thing/thingregistry 🚀

Are you planning to integrate it?

[rkoshak]

This probably doesn't need to be implemented as part of the library itself. You can do the following right now:

const thingRegistry = osgi.getService('org.openhab.core.thing.ThingRegistry');
const allThings = thingRegistry.getAll();

That will give you a Java Set I think. If you need to you can convert it to a JS Array

const jsAllThings = utils.javaSetToJsArray(allThings);

If I'm wrong and it's a List, well there's a javaListToJsArray function too.