We need to add some way (module/profile) to execute lang model TCKs.
The execution is rather straightforward, it is just about including it somehow.
We'll also need to make sure it's tested - it doesn't need to be part of standard build (mvn clean install), but GH actions should test it during PRs.

CDI issue - https://github.com/eclipse-ee4j/cdi/issues/583
TCKs can be seen here - https://github.com/eclipse-ee4j/cdi-tck/tree/master/lang-model