feat: add support for europe_tub grid model in plotting functions

[merrielle]

Pull Request doc

CURRENT STATUS:

• all maps working for both europe and usa
• tooltips on interconnection map: broken for europe, working for usa. Most likely won't fix as this is due to shapefile data.
• utilization map: blank for europe, working for usa (Cause is unclear because bind and risk maps work for europe!)
• emissions maps: need to remove hardcoded carbon resource types such as ng and coal
• fixing ModelImmutables, which should be fetched from the grid object instead of CSV files
  • this should fix a handful of the non-map graphs, which break while trying to load those CSVs
• tests have been omitted until they're in better shape

Purpose

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What the code is doing

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Testing

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Usage Example/Visuals

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