Lidar azimuth fix

[rcjackson]

I've fixed the naming of the "time" dimension to be "azimuth" to be consistent with the CF/Radial 2 standard for the Halo Photonics reader. In addition, a few fixes were made to the sweep variables.

• Changes are documented in history.md

[codecov]

Codecov Report

Attention: Patch coverage is 90.62500% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.95%. Comparing base (71ebcc6) to head (0fbdad4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
xradar/io/backends/hpl.py	90.62%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
- Coverage   91.97%   91.95%   -0.03%     
==========================================
  Files          23       23              
  Lines        4538     4562      +24     
==========================================
+ Hits         4174     4195      +21     
- Misses        364      367       +3     

Flag	Coverage Δ
notebooktests	78.29% <90.62%> (+0.04%)	⬆️
unittests	90.22% <90.62%> (-0.02%)	⬇️

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[kmuehlbauer]

Thanks @rcjackson!