Add calib_table function to summarize endogenous calibration targets

[jdebacker]

Adds calib_table() to output_tables.py, which produces a 5-column table showing each calibrated parameter's name/symbol, value (or range), data target description, model moment, and data moment. Supports wealth Gini (beta_annual), investment rate I/K (delta_annual), and income Gini (e) as initial target types.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 3.92157% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.52%. Comparing base (673b1f3) to head (8139ba5).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
ogcore/output_tables.py	3.92%	49 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1138      +/-   ##
==========================================
- Coverage   73.18%   72.52%   -0.67%     
==========================================
  Files          21       21              
  Lines        5233     5284      +51     
==========================================
+ Hits         3830     3832       +2     
- Misses       1403     1452      +49     

Flag	Coverage Δ
unittests	72.52% <3.92%> (-0.67%)	⬇️

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Files with missing lines	Coverage Δ
ogcore/output_tables.py	78.41% <3.92%> (-16.74%)	⬇️

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