Provide weather_cell_id for fluctuating generators

[gplssm]

The goal is to assign each fluctuating generator to a weather cell in order to pick the right time series when data is used in eDisGo.

Task list

• Query weather_cell_id for wind and solar
• Introduce new attribute and assign it during data import
• Test resulting data with eDisGo (in according feature branch)
• When versioned Views are available, change back config file modification
• Once DP v0.4.0 is done and ego.io v0.4.0 is released, replace dependency link by actual release

Questions

• What about time series for hydro power? Are these available too @wolfbunke

[gplssm]

As currently no data is available in model_draft, it's just a dry-run implementation that needs to be tested with data.

[boltbeard]

I have tested the data in eDisGo making the changes to the importers and this seems to work as expected, showing the weather cell ids in the GeneratorFluctuating objects