Add georeference accessor

[mgrover1]

Add a georeference accessor which works with dataarrays, datasets, and datatrees.

[codecov[bot]]

Codecov Report

Merging #60 (e095877) into main (82a8fe4) will increase coverage by 0.14%. The diff coverage is 100.00%.

:exclamation: Current head e095877 differs from pull request most recent head 68ade47. Consider uploading reports for the commit 68ade47 to get more accurate results

@@            Coverage Diff             @@
##             main      #60      +/-   ##
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+ Coverage   83.29%   83.43%   +0.14%     
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  Files          17       17              
  Lines        3118     3146      +28     
==========================================
+ Hits         2597     2625      +28     
  Misses        521      521              

Flag	Coverage Δ
unittests	83.43% <100.00%> (+0.14%)	:arrow_up:

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

Impacted Files	Coverage Δ
xradar/accessors.py	68.18% <100.00%> (+29.05%)	:arrow_up:
xradar/georeference/transforms.py	100.00% <100.00%> (ø)

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[mgrover1]

@kmuehlbauer when you get a chance, any feedback here would be greatly appreciated!

[mgrover1]

Thanks for the comments and suggestions @kmuehlbauer - I added in those kwargs to the accessors + datatree transform

[kmuehlbauer]

@mgrover1 I'm sorry if the recent merges of my other two PR messed up rebase of your branch.

[mgrover1]

@kmuehlbauer no worries!