Eevee: bake realtime lighting

This would be a huge time saver for many use cases that do not need the full (and slow) rendering power of Cycles.

I want to make changes to a scene, verify the realtime rendering result, hit a button and be done baking in less than a minute. This would be a huge time saver for many realtime use cases.

There's a 7-year-old open issue in the tracker, with no updates: projects.blender.org/blender/blender/issues/68921