trapi validation issue with biolink:support_graphs

[colleenXu]

Describe the bug
There's an issue with TRAPI validation where KG edges with the attribute biolink:support_graphs are being flagged with a warning. I think this is happening because support_graphs isn't an association slot in the biolink-model or is somehow not being recognized as a valid edge-attribute attribute_type_id...

This is an example warning message from BTE's validation report at this PK.

* Knowledge Graph Edge Attribute Type Id Not Association:
=> Edge has an attribute_type_id that is not an association slot
	$ infores:biothings-explorer
		# biolink:support_graphs:
		- edge_id: 
			MESH:C007789--biolink:treats->MONDO:0007035
	$ global
		# biolink:support_graphs:
		- edge_id: 
			CHEMBL.COMPOUND:CHEMBL4298120--biolink:treats->MONDO:0007035

What working group (or team) did this request originate from?
Exploring Agent / Service Provider

@sierra-moxon @RichardBruskiewich

[sierra-moxon]

thanks @colleenXu.

[sierra-moxon]

@colleenXu - #1364 for your review.

[colleenXu]

Looks like the PR will help.

I'm unsure if there's a way to test whether PRs / latest versions of biolink-model help with reasoner-validator errors. Based on the docs for reasoner-validator, it looks like it depends on biolink-model toolkit. And it's unclear to me if biolink-model toolkit can handle PRs / latest versions of biolink-model (above 3.5.0?)....