This is implemented mostly manually because the API is a bit weird
and we need to do some extra work to make it work properly.
Also basing it on a Builder makes it much nicer to user.
This commit also includes required new types either generated with `gir`
or manually implemented when required.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1227>
