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 83.90805% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.97%. Comparing base (ddd65d8) to head (39d6550).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
policyengine_api/country.py	75.92%	9 Missing and 4 partials ⚠️
policyengine_api/services/economy_service.py	89.69%	6 Missing and 4 partials ⚠️
...olicyengine_api/services/reform_impacts_service.py	57.14%	3 Missing ⚠️
policyengine_api/libs/simulation_api_modal.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3394      +/-   ##
==========================================
+ Coverage   72.58%   72.97%   +0.39%     
==========================================
  Files          56       56              
  Lines        2477     2598     +121     
  Branches      431      460      +29     
==========================================
+ Hits         1798     1896      +98     
- Misses        598      617      +19     
- Partials       81       85       +4     

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