hlssink/hlssink2: configurable playlist types, write EXT-X-PLAYLIST-TYPE to playlists
gstm3u8playlist.c has support for playlist types
VOD, but it doesn't do anything with them.
It would be very advantageous to write that event type into the rendered playlist, plus also expose the playlist type as an option.
The lack of this playlist type being written means that some browsers with built-in HLS support (read: iOS Safari) don't allow for seeking through the playlist as without the type explicitly being set to EVENT or VOD, they don't assume that the segments will never change.