Use bilinear interpolation to calculate pollutant values for given lat/long

[amehta-scottlogic]

Description

This changes the selection of the pollutant values from nearest to bilinear interpolation to a given lat/long.

Unit test are also updated to remove duplicated test effort (e.g. testing AQI/pollutant value calculation again in formatting test)

cerberus is added as a library to validate a dictionary schema

I've also condensed the conda env file we had to include only dependencies we explicitly require + also making it work cross platform

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
242	179	74%	0%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
air-quality-backend/src/etl/forecast/forecast_adapter.py	100%	🟢
TOTAL	100%	🟢

updated for commit: 960cdae by action🐍