Pipe GStreamer logging to rust

[fkaa]

Is your feature request related to a problem? Please describe.
Pipe output of GStreamer logging to rust so we can put it through whatever logging framework we have to avoid GStreamer log output competing with rust stdout.

Describe the solution you'd like
See https://gstreamer.freedesktop.org/documentation/gstreamer/gstinfo.html?gi-language=c#gst_debug_add_log_function