Look for metadata.txt if metadata.json does not exist; closes #93

[moble]

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📚 Documentation preview 📚: https://sxs--104.org.readthedocs.build/en/104/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 42.17%. Comparing base (aa54497) to head (7b38ae1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...andlers/rotating_paired_diff_multishuffle_bzip2.py	25.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   42.19%   42.17%   -0.02%     
==========================================
  Files          78       78              
  Lines        6532     6534       +2     
  Branches     1326     1327       +1     
==========================================
  Hits         2756     2756              
- Misses       3531     3532       +1     
- Partials      245      246       +1     

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