Allow the semantic data provider to return ldo objects

Instead of returning anonymous objects, we could allow the semantic data provider to return objects of type [ldo](https://github.com/o-development/ldo). The advantage is that the object would be typed, and that we wouldn't be able to use properties that don't exist. See:

https://o-development.github.io/ldo.js.org/api/ldo/#simple-example

This new library could also be used to handle updates (at the bottom of the example, there is an example of the `.toSparqlUpdate` method)

Alternative option: https://github.com/assemblee-virtuelle/semapps/issues/1122

The issue names no repository files or tests. Start by locating the semantic data provider and reading the linked LDO simple example, then compare the alternative issue; done would require an agreed way to return typed LDO objects and handle updates.

Written by the indexing model from the issue text.