adapter: port the buffer list from GSList to GstQueueArray
adapter: port the buffer list from GSList to GstQueueArray

Significantly reduces the amount of memory allocation operations.

https://bugzilla.gnome.org/show_bug.cgi?id=795167

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer