Attach PolicyEngine bundle metadata to economy results

[MaxGhenis]

Summary

• include policyengine/model/data bundle metadata in society-wide economy results
• fold the resolved bundle into cache identity and persisted execution metadata
• add focused economy service coverage for the resolved bundle

Refs #3393.

[codecov]

Codecov Report

❌ Patch coverage is 88.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.83%. Comparing base (ddd65d8) to head (4af4be3).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
policyengine_api/services/economy_service.py	88.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3394      +/-   ##
==========================================
+ Coverage   72.58%   72.83%   +0.24%     
==========================================
  Files          56       56              
  Lines        2477     2496      +19     
  Branches      431      432       +1     
==========================================
+ Hits         1798     1818      +20     
- Misses        598      599       +1     
+ Partials       81       79       -2     

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