Consider only the first primary URI of entities

[gythaogg]

where an entity might have more than one URI

primary URI is one that is in the same domain as
defined in APIS_BASE_URI in settings

the default value for APIS_BASE_URI is hardcoded to be consistent with the same value used in apis_entities at the time of the creation of the URI object

Resolves issue:

• URIs - one per entity or multiple? #221

Checklist (Replace the space in square brackets with a lowercase x for all that apply)

• [x ] My changes don't generate new warnings or errors
• [x ] My changes follow the project's code formatting rules and style guidelines
• I have commented my code with Docstrings and code comments, particularly complex, unusual or hard-to-read code
• I have updated the project documentation to reflect the changes I introduce
• I have added new unit tests or updated existing ones to demonstrate my changes works

[b1rger]

Please format the commit message title according to the conventional commit standard. I.e. fix(apis_relations): fix entity lookup for multi URI entities

Please add Closes: #221 to the commit message body.

There are a couple of newlines removed from the file, those changes have nothing to do with the fix itself. Ideally those would be removed (Probably some setting from your editor?)

Other than that - LGTM!

[b1rger]

Thanks!