Fetch usa_tamu data from zenodo

[rouille]

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• Is your feature request essential for your project?

Describe the workflow you want to enable

Similarly to what is done for PyPSA-Eur (see the TUB class enclosed in the powersimdata.network.europe_tub.model module), the usa TAMU csv files should be downloaded from Zenodo to efficiently track the grid model version.

Describe your proposed implementation, if applicable

• A new column in the ScenarioList file would specify the grid model version
• A new parameter in the constructor of the Grid class would allow to access different version. A new attribute would enclose the grid model version.

Additional context

Every time, we update the model (ramp_30, Pmax, etc), a new release should be created on Zenodo.