CfRadial1 reader kwargs refactor, add to_cfradial2 exporter

[kmuehlbauer]

1. CfRadial1 reader kwarg refactor:

"""
    first_dim : str
        Can be ``time`` or ``auto`` first dimension. If set to ``auto``,
        first dimension will be either ``azimuth`` or ``elevation`` depending on
        type of sweep. Defaults to ``auto``.
    optional : bool
        Import optional mandatory data and metadata, defaults to ``True``.
    site_coords : bool
        Attach radar site-coordinates to Dataset, defaults to ``True``.
"""

swp = xr.open_dataset(fname, group="sweep_0", site_coords=False, optional=False, first_dim="time", engine="cfradial1")

These kwargs are available for DataTree loading, as well as Dataset-loading.

2. Add to_cfradial2 export function
   • added functionality to model to conform a sweep dataset, such that only CfRadial2 conforming data is written (needs extension and enhancement)

Todo: Add tests for the introduced functionality.

closes: #48

This PR also updates pre-commit hooks:

- add nbstripout, to clean notebooks before committing - remove the double-quote-string-fixer, as it contradicts with black-formatting - remove the skip-string-normalization from black-formatting - format with black

I can split this into two, if necessary. Need to make sure to do rebase-merge otherwise. This part moved to #50

[codecov[bot]]

Codecov Report

Merging #49 (e3a7cb6) into main (2aab4dc) will decrease coverage by 0.20%. The diff coverage is 73.77%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   85.61%   85.41%   -0.21%     
==========================================
  Files          15       17       +2     
  Lines        3079     3119      +40     
==========================================
+ Hits         2636     2664      +28     
- Misses        443      455      +12     

Flag	Coverage Δ
unittests	85.41% <73.77%> (-0.21%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
xradar/io/export/cfradial2.py	34.78% <34.78%> (ø)
xradar/model.py	94.25% <95.00%> (+0.09%)	:arrow_up:
xradar/io/backends/cfradial1.py	88.02% <100.00%> (+2.12%)	:arrow_up:
xradar/io/export/__init__.py	100.00% <100.00%> (ø)
xradar/io/export/odim.py	95.04% <100.00%> (ø)

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[kmuehlbauer]

PR docs

• Sweep group kwargs
• Export/Roundtripping to_netcdf
• Export/Roundtripping to_cfradial2

[mgrover1]

@kmuehlbauer I think we can go ahead and merge this

[kmuehlbauer]

Yes, we can add anything I forgot in follow up PR's.