Split setting parameters from the inputs endpoint into a separate endpoint.

[robcalon]

The https://engine.energytransitionmodel.com/api/v3/scenarios/xxxx/inputs endpoint contains mostly float-like parameter values with the occasional boolean or enum typed parameters. Processing mixed types from the endpoint is becoming increasingly painful in exporting results as most Python libraries don't like mixed types.

Would it be an option to split off the boolean and enum type parameters to a different endpoint, e.g. https://engine.energytransitionmodel.com/api/v3/scenarios/xxxx/settings to make it more easily to process the settings endpoint? I would also propose to migrate the boolean parameters that are now implemented as float-like parameters with 0, 1 to proper boolean parameters with an allowed setting of true/false to prevent setting a float value instead.

This would provide the additional benefit that inter- or extrapolation of parameters becomes more trivial as only float-like parameters can be inter- or extrapolated, you'd like to keep all 'settings' parameters the same.

[robcalon]

@noracato could you have a look at this one?

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