Magnetic Variation from WMM (World Magnetic Model) component

[mgrouch]

Describe the problem you have/What new integration you would like

Magnetic Variation from WMM (World Magnetic Model) component which calculates it based on location

This code can be re-used:

https://github.com/DavidArmstrong/WMM_Tinier

Please describe your use case for this integration and alternatives you've tried:

Additional context