Add a `num-lookahead` property that will 'prepare' a number of fragments in advance of the playhead if they have been deactivated or closed by a limited number of `num-open-fragments`. It can help to avoid any play stalls reading the indexes or headers of the next file from high-latency media or on resource limited machines. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7053>