Make `ScrollableFeed` virtualized by replacing `react-scrollable-feed` with `react-scrollable-feed-virtualized` (#268)

* Make `ScrollableFeed` virtualized by replacing `react-scrollable-feed` with `react-scrollable-feed-virtualized`

* fix get new entries button

* Fix the not populated `Protocol` struct in case of `GetEntries` endpoint is called
Co-authored-by: Liraz Yehezkel <lirazy@up9.com>