Under src I would add the parent directory for pipeline and  utils and put there __init__.py

resources/
  |- etl_event/
     |- etl_event.job.yml
src/
  |- project/
    __init__.py
    |- pipeline/
       |- etl_event/
          |- transformers/
            |- transformer_1.py
     |- utils/
       __init__.py
       |- logger.py
databricks.yml