feat: add the get_tabular_report() method to DataScan

[rich-iannone]

This adds a tabular reporting option to the DataScan class. It provides simple column-level summaries of a scanned table.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.12403% with 5 lines in your changes missing coverage. Please review.

Project coverage is 98.77%. Comparing base (98b0f18) to head (4e0ae1b).

Files with missing lines	Patch %	Lines
pointblank/datascan.py	96.06%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   98.88%   98.77%   -0.11%     
==========================================
  Files          16       16              
  Lines        3305     3430     +125     
==========================================
+ Hits         3268     3388     +120     
- Misses         37       42       +5     

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