QoL fix: Enhance the entitlement stuff with data from the actual api docs now there are some

[braindigitalis]

Adds missing fields from the docs and no longer assumes guild and user are both owner_id

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[braindigitalis]

NOTE

This is a breaking change, as it changes the fields directly within dpp::entitlement. The old fields were insufficient for the reality of the API.