Add CTK validation to PR checks and Go tests

[ricardozanini]

What would you like to be added:
We have a few feature files defined in the specification:
https://github.com/serverlessworkflow/specification/blob/main/ctk/features/

The reference implementation can now run a few. Currently, we are fetching the spec repository during PR checks to validate the parser. We can do the same for the features to validate the implementation.

Our implementation does not support all the features in the repo so that we might need a filter for the ones supported.

Why is this needed:
To improve the quality of our code base.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.