Add situ data api source and added meta_data to in situ database documents

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
238	213	90%	0%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
air-quality-backend/src/etl/forecast/forecast_data.py	100%	🟢
air-quality-backend/src/etl/in_situ/openaq_adapter.py	96%	🟢
TOTAL	98%	🟢

updated for commit: dad693b by action🐍