Adds a new DataSet Accessor

[banesullivan]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.30769% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.57%. Comparing base (ca1d316) to head (63bdb11).

Files with missing lines	Patch %	Lines
pvxarray/accessor.py	91.42%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   94.78%   94.57%   -0.21%     
==========================================
  Files          11       11              
  Lines         479      516      +37     
==========================================
+ Hits          454      488      +34     
- Misses         25       28       +3     

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