setDefaultValueCallback() & setDefaultValue() should be on FieldDefinitionInterface, not FieldConfigInterface

This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.

Seems this survived the review queue purge.

So to continue the conversation #8 should this be a documentation update?

If not Patch for #3
- New functions and properties should be typehinted for D10
- Needs a test case to show the issue

Did not test for the issue locally

Thanks!

Came up as a random BSI triage. As per #8 we can rescope this as a documentation issue.