In many places in the log tracer %d was used for data types we have
string format functions. This is especially problematic when the data
type is not immediately obvious to the reader (e.g. gboolean vs
GstFlowRet, where TRUE==1 but GST_FLOW_OK==0) or the values are not easy
to memorize (GST_STATE_CHANGE_PLAYING_TO_PAUSED==35).
This patch replaces all the integer codes with string representations so
that the logs are easier to understand by humans.
The formatting of GstBufferList by the log tracer is also updated to use
GST_PTR_FORMAT instead of a raw pointer, so the user can see the
timestamps, size and number of buffers.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8414>
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