Endogenously estimate parameters: beta, chi_n, chi_b

[jdebacker]

This PR adds utilities to estimate the household preference parameters $\beta_j$, $\chi^n_s$, $\chi^b_j$ via indirect inference (aka simulated method of moments).

This improves previous functionality that did not estimate these parameters jointly.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 73.14488% with 152 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.18%. Comparing base (b805ee8) to head (2ee8526).
⚠️ Report is 39 commits behind head on master.

Files with missing lines	Patch %	Lines
ogusa/estimate_lifecycle_params.py	73.09%	152 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #152       +/-   ##
===========================================
+ Coverage   28.73%   46.18%   +17.44%     
===========================================
  Files          19       21        +2     
  Lines        1472     2425      +953     
===========================================
+ Hits          423     1120      +697     
- Misses       1049     1305      +256     

Flag	Coverage Δ
unittests	46.18% <73.14%> (+17.44%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
ogusa/compute_moments.py	74.10% <100.00%> (ø)
ogusa/estimate_lifecycle_params.py	73.09% <73.09%> (ø)

... and 1 file with indirect coverage changes

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