WIP: fix sub-package level meta

[sir-sigurd]

Description

TODO

• user_meta vs meta?
• use sub-package level meta for top hash
• Unit tests
• Automated tests (e.g. Preflight)
• Confirm that this change meets security best practices and does not violate the security model
• Documentation
  • Python: Run build.py for new docstrings
  • JavaScript: basic explanation and screenshot of new features
  • Markdown somewhere in docs/**/*.md that explains the feature to end users (said .md files should be linked from SUMMARY.md so they appear on https://docs.quiltdata.com)
  • Markdown docs for developers
• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 38.43%. Comparing base (ee0aea3) to head (2d89857).
Report is 2 commits behind head on master.

Files	Patch %	Lines
api/python/quilt3/packages.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4037   +/-   ##
=======================================
  Coverage   38.43%   38.43%           
=======================================
  Files         718      718           
  Lines       33051    33053    +2     
  Branches     4842     4842           
=======================================
+ Hits        12704    12705    +1     
- Misses      19196    19197    +1     
  Partials     1151     1151           

Flag	Coverage Δ
api-python	90.74% <50.00%> (-0.02%)	⬇️
catalog	11.50% <ø> (ø)
lambda	87.96% <ø> (ø)

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