Add basic AV1 mime codec param generation based on the spec at https://aomediacodec.github.io/av1-isobmff/#codecsparam Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6696>
This is the opposite of `gst_codec_utils_caps_get_mime_codec()`, which allows elements to get the `GstCaps` Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1894>