This adds a new `DownloadingHistoryArchivesFinished` signal to the
family of community archive signals. It's emitted when all to be
downloaded archives have been downloaded and handled.
This introduces logic needed to:
- Create WakuMessageArchives and and indices from store waku messages
- History archive torrent data to disk and create .torrent file from
that
- Seed and unseed history archive torrents as necessary
- Starting/stopping the torrent client
- Enabling/disabling community history support for individual components
and starting/stopping the routine intervals accordingly
This does not yet handle magnet links (#2568)
Closes#2567
Pascal Precht