Remove cached chunks from dataset pickle

[FayazRahman]

🚀 🚀 Pull Request

Impact

• Bug fix (non-breaking change which fixes expected existing functionality)
• Enhancement/New feature (adds functionality without impacting existing logic)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

• Cached chunks should not be present in the serialized dataset
• Set these attributes to None in the ChunkEngine before returning the state in __getstate__

Things to be aware of

Things to worry about

Additional Context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ba57790) 84.43% compared to head (4fc7eca) 83.86%.
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2711      +/-   ##
==========================================
- Coverage   84.43%   83.86%   -0.57%     
==========================================
  Files         233      233              
  Lines       26064    26087      +23     
==========================================
- Hits        22007    21879     -128     
- Misses       4057     4208     +151     

Flag	Coverage Δ
unittests	83.86% <100.00%> (-0.57%)	⬇️

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication