Add AQICN API code

[amehta-scottlogic]

Code is unused - but might be useful later

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
344	231	67%	0%	🟢

New Files

File	Coverage	Status
air-quality-backend/src/air_quality/etl/in_situ/aqicn_dao.py	0%	🟢
TOTAL	0%	🟢

Modified Files

No covered modified files...

updated for commit: 8730769 by action🐍