Wetterdienst

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- Add summary of multiple weather stations for a given lat/lon point (currently only works for DWDObservationRequest)

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- Make DwdMosmixRequest return data according to start and end date

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- Fix passing an empty DataFrame through unit conversion and ensure set of columns

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- Add interpolation of multiple weather stations for a given lat/lon point (currently only works for DWDObservationRequest)
- Fix access of DWD Observation climate_urban datasets

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- Slightly adapt the conversion function to satisfy linter
- Fix parameter names:
- we now use consistently INDEX instead of INDICATOR
- index and form got mixed up with certain parameters, where actually index was measured/given but not the form
- global radiation was mistakenly named radiation_short_wave_direct at certain points, now it is named correctly
- Adjust Docker images to fix build problems, now use python 3.10 as base
- Adjust NOAA sources to AWS as NCEI sources currently are not available
- Make explorer work again for all services setting up Period enum classes instead of single instances of Period for
period base

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- Use lxml.iterparse to reduce memory consumption when parsing DWD Mosmix files
- Fix Settings object instantiation
- Change logging level for Settings.cache_disable to INFO
- Add DWD Observation climate_urban datasets