Add grid intensity to the hog interface

[ribalba]

We would like to show the grid intensity when you open the hog. This should enable the user to make an informed decision when to start energy hungry workloads.

0. Look at when open and free apis are out there for as many countries/ regions as possible
1. Implement an api endpoint that gives you the energy mix for a given region
2. Extend the hog swift program to query that endpoint based on the location.
3. Display the grid intensity

Open questions:

0. Should we get the location in the form of lat/long from the MacOS?
1. Should the user set the location in the install.
2. How do we expose the grid intensity without violating the license of the provider

Links:

• https://smard.api.bund.dev/
• https://pypi.org/project/electricityapi/
• https://api.energy-charts.info/#/power/public_power_public_power_get