Have the elements in the DrilldownPane view (in JSON editor) to follow the scroll

Hello so basically we have this currently:

![image](

As you can see, if you have a lot of elements, you everytime need to scroll to the top to check the content of it.

So i think would be nice to have something like this;
![image](

This way even if you are on the element 100 you can still have a look and move on.

I already have the PR ready if you want, its a very simple one. Lemme know if it sounds good.