[Akonadi Console] Improve and extend the "Save to file" feature
Open, Needs TriagePublic

Description

Right now the "Job Tracker" and "Resource Schedulers" tabs have "Save to file" button that saves the content of the tree into a plain text file. We would like to have the button also in the "Notification monitor" and "Monitors" tabs.

We would also like to save into JSON instead of a plain text file, so that the data are machine-readable.