Create a new Directed Graph flows to support PNF RPCs for GR-API. 

Assign DG will trigger CDS components then process blueprint and trigger capabilities for assignment and persist in MDSAL.

Self-Serve DG (RA plugin enhancement to use GRPC client ): 

Self-Serve DG to trigger GRPC client sendRequest method (plugin ) to call CDS microservice

mode to specify (sync/async)  

for aysnc mode , Alexis to let us know