Add bindings for typefind/typefind factor
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTypeFind.html https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstTypeFindFactory.html
Mostly autogenerated, except for the function pointer in gst_typefind_register
.