Analyse service: Add stats determination functionality

.gitlab-ci.yml

dbrepo-analyse-service/Dockerfile

dbrepo-analyse-service/Pipfile

dbrepo-analyse-service/Pipfile.lock

dbrepo-analyse-service/app.py

dbrepo-analyse-service/build.sh

dbrepo-analyse-service/config.py

dbrepo-analyse-service/data/test_stats/test_stats_01.csv

dbrepo-analyse-service/determine_dt.py

dbrepo-analyse-service/determine_pk.py

dbrepo-analyse-service/determine_stats.py

dbrepo-analyse-service/pywsgi.py

dbrepo-analyse-service/test/conftest.py

dbrepo-analyse-service/test/init-data-db.sh

dbrepo-analyse-service/test/init-db.sh

dbrepo-analyse-service/test/test_determine_dt.py

dbrepo-analyse-service/test/test_determine_pk.py

dbrepo-analyse-service/test/test_determine_stats.py