Added LevelDB-based attribute container store

[joachimmetz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 97.22222% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 85.30%. Comparing base (e5331cf) to head (871f608).

❗ Current head 871f608 differs from pull request most recent head 57c82e5. Consider uploading reports for the commit 57c82e5 to get more accurate results

Files	Patch %	Lines
acstore/leveldb_store.py	97.22%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   83.35%   85.30%   +1.95%     
==========================================
  Files          10       11       +1     
  Lines         853      953     +100     
==========================================
+ Hits          711      813     +102     
+ Misses        142      140       -2     

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