Currently, Eolian free functions aren't handled by `eolian-mono`.
We should provide a way so they are respected when handling `@owned` types in the C# api.
Partial list of of free funcs used:
* `efl_del`
* `efl_ui_focus_relation_free`
* `eina_accessor_free`
* `eina_array_free`
* `eina_binbuf_free`
* `eina_hash_free`
* `eina_iterator_free`
* `eina_list_free`
* `eina_promise_free`
* `eina_rectangle_free`
* `eina_strbuf_free`
* `eina_stringshare_del`
* `eina_value_flush`
* `eina_value_free`