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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/quiltdata/quilt/pull/4037/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | Coverage Δ | | |---|---|---| | [api-python](https://app.codecov.io/gh/quiltdata/quilt/pull/4037/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | `90.74% <50.00%> (-0.02%)` | :arrow_down: | | [catalog](https://app.codecov.io/gh/quiltdata/quilt/pull/4037/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | `11.50% <ø> (ø)` | | | [lambda](https://app.codecov.io/gh/quiltdata/quilt/pull/4037/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | `87.96% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.