Manage Multiple DataSetMessage in PubSub UADP messages
This MR is continued on !773 (merged) and includes the remarks made on !773 (merged).
The review can be continued after commit 22b666038cd2826e81201a4db60a81f149f00219
Closes #944 (closed), #945 (closed), #936 (closed)
Edited by Jérémie Chabod