Make available the complete lists of network hosts, notifications, and connections

[GyulyVGC]

At the moment, only the top 30 network hosts are shown in the Overview page of the app, and only the 30 most recent notifications are displayed in the Notifications page.

This is due to the fact that iced doesn't render efficiently lists with a huge number of entries, and will be fixed with the introduction of the list widget.

Once the solution will be available, it'll also be used to represent all the connections in the Inspect page in a single list, without the need of paginating them.