Improve pipeline_step
This MR set pipeline step of all involved receivers and consumers: (receiver consumer, metadata consumer, sender producer and sender consumer) to the group_id. Group_id (if not given) is set to sender data_source (if exists).
This MR set pipeline step of all involved receivers and consumers: (receiver consumer, metadata consumer, sender producer and sender consumer) to the group_id. Group_id (if not given) is set to sender data_source (if exists).