Add TranscodingSegmentCleaner to replace ffmpeg's hlsenc deletion

FFmpeg deletes segments based on its own transcoding progress,
but we need to delete segments based on client download progress.
Since disk and GPU speeds vary, using hlsenc's built-in deletion
will result in premature deletion of some segments. As a consequence,
the server has to constantly respin new ffmpeg instances, resulting
in choppy video playback.

Signed-off-by: nyanmisaka <nst799610810@gmail.com>

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