feat(core): relation loader using instance raw data

[paul-thebaud]

What problem is this solving

For REST API which serialize only the related IDs, a new relation loader which uses those data should be useful.

Proposed solution

Add a new relation loader factory with various options:

• IDs extraction from raw instance's data
• Model action filtering (just like inside makeRefreshIncludeLoader)

Describe alternatives you've considered

No response