Add a test for "(in) (transfer floating)" parameters beeing an alias for "(in) (transfer none)".

The "(in)" alias was (unintenionally?) introduced in
https://git.gnome.org/browse/gobject-introspection/commit/?id=699ad0fec427c79bec1
which added an alias for return annotations. This change makes sure that this continues
to work.

Functions which ref_sink in params are currently marked as transfer-none since in the
case of non-floating objects (which all bindings use) no ownership gets transfered.
But in case of floating objects, which is the common case when using the C API directly,
the ownership _is_ transfered. Using transfer-floating should make this clearer
while giving the same result for bindings.

Functions where this could be used: gst_bin_add, gtk_container_add, gst_element_add_pad

See https://bugzilla.gnome.org/show_bug.cgi?id=657202 and https://bugzilla.gnome.org/show_bug.cgi?id=702960

https://bugzilla.gnome.org/show_bug.cgi?id=742618

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