Fetch usa_tamu data from zenodo

# :rocket:

- [ ] 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.