[feature]: issue-relation support in API

[tobias-urdin]

Is there an existing issue for this?

• I have searched the existing issues

Summary

There is no issue-relation API endpoint in the API.

There is such an endpoint for the app on /api/workspaces/{workspace}/projects/{project}/issues/{issue}/issue-relation/ but there is no such endpoint in the API on /api/v1/workspaces/{workspace}/projects/{project}/issues/{issue}/issue-relation/

Why should this be worked on?

If you are migrating issues from another system, or just want to managed relates_to/blocked_by/blocking relationships between issues using the API that is currently not possible and you must do it through the UI or directly in the database.

[tobias-urdin]

It would be nice if it also supported overriding with created_by and created_at like the other API endpoints, when migrating from another system that's very useful.