GONRG-3815: Make osdu_api.ini optional
The goal of this MR is to make using osdu_api.ini
file for osdu_api
optional.
Now, we are able to use Airflow variables
for initializing different osdu_api
clients.
Also, this MR depends on osdu-ingestion-lib!25 (merged)
Edited by Yan Sushchynski (EPAM)