FIX: 8bit/16bit, big-endian/little-endian in nexrad reader

[kmuehlbauer]

• Closes Issue with ZDR when reading data with nexrad_level2 reader #230
• Tests added
• Changes are documented in history.md

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.78%. Comparing base (794c606) to head (7cd1eb6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
xradar/io/backends/nexrad_level2.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
- Coverage   92.80%   92.78%   -0.02%     
==========================================
  Files          26       26              
  Lines        5003     5005       +2     
==========================================
+ Hits         4643     4644       +1     
- Misses        360      361       +1     

Flag	Coverage Δ
notebooktests	79.02% <90.00%> (-0.02%)	⬇️
unittests	91.18% <30.00%> (-0.04%)	⬇️

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[kmuehlbauer]

@syedhamidali Could you please test your workflow with these changes?

We would have to create a release branch for the 0.7-line and backport this. Otherwise users are forced to upgrade to latest xarray. This might take some time to figure out the workflows, though.

[syedhamidali]

@kmuehlbauer Yes looks better now. Thank you!