Implement ordering of results (default order and through QueryParameters argument)

[kevinstadler]

Ordering of results should be possible based on a single scalar field of the root model.

1. should be able to specify default order via ConfigDict of root python model
2. should be specifiable dynamically through a QueryParameter (that can be exposed to FastAPI)

[lu-pl]

Note: If ordering should be possible 1. via query parameters and 2. model_config, then query parameter ordering should take precedence over model_config orderings.

We discussed possible ordering by all scalar fields, i.e. also scalar fields of potentially nested models. This introduces the significant problem of how to handle alias name clashes though. So I am for restricting order-able fields to the top model scalar fields.

It is still possible to order by arbitrary SPARQL bindings through the model then, i.e. by using excluded fields in the top model. See e.g. the ungrouped wikidata example.