Add analyzer_versions to AppMetadata

[google-labs-jules]

Implemented the final proposal for issue #251 by adding the analyzer_versions field to AppMetadata in clams/appmetadata/__init__.py. This new field allows multi-model apps to specify versions for multiple components. The singular analyzer_version field remains for single-model apps, and no validation is enforced on it (specifically, the hf- format proposal was discarded). Added comprehensive tests in tests/test_appmetadata.py to verify the new field and ensure existing functionality remains intact.

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PR created automatically by Jules for task 17929783131841457298 started by @keighrim

[google-labs-jules]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.37%. Comparing base (9dcad01) to head (2d3dcb9).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #268      +/-   ##
===========================================
+ Coverage    61.33%   61.37%   +0.04%     
===========================================
  Files            6        6              
  Lines          812      813       +1     
===========================================
+ Hits           498      499       +1     
  Misses         314      314              

Flag	Coverage Δ
unittests	61.37% <100.00%> (+0.04%)	⬆️

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