gen_edge3: implement "generate" flag for all nodes
Reksio has a "generate" flag in x-driver-edge for registers:
https://gitlab.cern.ch/Cheburashka/gui/-/blob/master/schema/schema.yaml#L1232
Propose to implement this for all nodes. If set to False (default will be True) then this node (and all children) will not be generated in the driver.
This will replace the current "include-fields" flag which will be removed.