Wetterdienst

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- Start migrating from ``dogpile.cache`` to ``filesystem_spec``

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Features
========

- Enable selecting a parameter precisely from a dataset by passing a tuple like [("precipitation_height", "kl")] or
[("precipitation_height", "precipitation_more")], or for cli/restapi use "precipitation_height/kl"
- Rename ``wetterdienst show`` to ``wetterdienst info``, make version accessible via CLI with
``wetterdienst version``

Bugfixes
========

- Bug when querying an entire DWD dataset for 10_minutes/1_minute resolution without providing start_date/end_date,
which results in the interval of the request being None
- Test of restapi with recent period
- Get rid of pandas performance warning from DWD Mosmix data

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- Bugfix acquisition of DWD radar data
- Adjust DWD radar composite parameters to new index

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- Bugfix tidy method for DWD observation data

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- Update readme on sandbox developer installation
- Bugfix show method

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- Change cli base to click
- Add support for wetterdienst core API in cli and restapi
- Export: Use InfluxDBClient instead of DataFrameClient and improve connection handling with InfluxDB 1.x
- Export: Add support for InfluxDB 2.x
- Fix InfluxDB export by skipping empty fields
- Add show() method with basic information on the wetterdienst instance