Add data-export for inputs

[mabijkerk]

We have a number of data-exports in our front-end relating to the output of a scenario. I would like to add a data-export for the inputs that have been set in a scenario. It would be a CSV containing at least the following:

• key
• min
• max
• present value: default
• future value: user
• unit
• share group

A lot of this information is already present in the inputs API, judging by our docs. We should not forget to add a new slide in the front-end. @kaskranenburgQ and @louispt1 can pick this up at some point.

It is up for discussion if we should stick to the 'backend' labelling or make it more user readable.

[github-actions]

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