Switch element metadata to BiocFrame

[jkanche]

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.27%. Comparing base (69e0170) to head (540688d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/compressed_lists/base.py	78.94%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   83.16%   83.27%   +0.11%     
==========================================
  Files          10       10              
  Lines         582      592      +10     
  Branches       72       74       +2     
==========================================
+ Hits          484      493       +9     
- Misses         68       69       +1     
  Partials       30       30              

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