Endpoint for dag_run status

[hannelita]

Acceptance

• [x] <DAG_ID>/dag_run endpoint on CKAN which gives a report with the status of the DAG
• [x] Collect Airflow default API response for a DAG (for local and remote Airflow instances)

Note: This task won't provide any integration with GCP logs (see #69 ); it only collects the output of Airflow API

Tasks

• [x] Create endpoint; DAG_RUN is optional. If no DAG_RUN is specified, list the most recent dag_runs
• [x] If a DAG run is specified, retrieve info only for that particular RUN (note: when you trigger the DAG, the response brings the DAG_RUN (see #79)
• [x] Return Airflow API response (local Airflow)
• [x] Return Airflow API response (remote Airflow). It will require another integration with GCP