Add existing solar and wind farms

[WilliamsTravis]

Why this feature is necessary:
Because it would be useful to see the current build out and how it relates to the various technical potential maps reView displays.

A possible solution is:
For wind setup methods to use the USWTDB's API service to build and periodically update their dataset. For solar we can use Berkely Lab's dataset here, though they do not appear to have an API and the historical datasets don't have a consistent url pattern. Might be worth it to reach out to them directly.

It would be nice to overlay these datasets on top of the tech potential maps, though that could become a little complicated on the UI side since these will be time series and will have their own variable drop downs. It might be worth it to include them in the ReEDS page, though we'll still have mismatching variables and available dates. We could start with a separate page and to get it working and then think about integrating them will our model visualizations.