Graylog schema - follow OSSEM?

The [Graylog CIM](https://schema.graylog.org/en/stable/index.html) is a relatively new feature in Graylog. It is not the first such attempt in the community, including [ECS](https://www.elastic.co/guide/en/ecs/current/index.html), [Splunk CIM](https://docs.splunk.com/Documentation/CIM/4.18.0/User/Overview), and other [competing standards](https://xkcd.com/927/). One example is [OSSEM](https://ossemproject.com/intro.html), which is also relatively new, but has the advantage over the others to not be supported by one of Graylog's concurrents. It might be interesting for everyone that Graylog tries to integrate and improve the OSSEM schema instead of spending time and resources developing from scratch something that in the end will be very similar.