Persist collapse/expand state in JSON response preview

[ThenTech]

Currently collapsing a nested object in a JSON response works, but when switching to another tab and then back, this state is reset.
This is especially annoying when fetching a large list of objects that all have nested objects, these all become expanded again after switching tabs.

So I propose to persist this collapsed/expanded state between tabs and/or also add 2 buttons to collapse/expand all nodes in the JSON preview.