The position is no longer duplicated across each pad and pad's segment. The
position is now only updated if it changes in the direction of playback so that
quickly repeated forward seeks do not cause the stream to seek from 0.
Reverse playback is expressly disallowed and an unnecessary extra flush of track
when seeking was removed.
A background task was added to periodically check on the current position and
the media source's buffering levels to keep the ready state up-to-date. The
source buffer no longer needs to trigger this update, it will happen whenever
the element state is READY or higher.
Finally, added proper error reporting when failing to push a buffer and improved
debug logging.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8512>
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