Add value to the list of values for given property.
You can pass any kind of [struct@GObject.Value] for value, but serialization functions will normally only be able to
serialize URIs/relationships and fundamental value types (string, int, etc.).
| this |
the `TrackerResource` |
| property_uri |
a string identifying the property to set |
| value |
an initialised [struct@GObject.Value] |