Adding Harmenberg Method in Simulations

[wdu9]

Please ensure your pull request adheres to the following guidelines:

• Tests for new functionality/models or Tests to reproduce the bug-fix in code.
• Updated documentation of features that add new functionality.
• Update CHANGELOG.md with major/minor changes.

[codecov-commenter]

Codecov Report

Merging #1069 (43864b7) into master (910bff3) will increase coverage by 0.11%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #1069      +/-   ##
==========================================
+ Coverage   72.29%   72.40%   +0.11%     
==========================================
  Files          68       68              
  Lines       10200    10245      +45     
==========================================
+ Hits         7374     7418      +44     
- Misses       2826     2827       +1     

Impacted Files	Coverage Δ
...nsumptionSaving/tests/test_IndShockConsumerType.py	72.69% <ø> (+4.64%)	⬆️
HARK/ConsumptionSaving/ConsIndShockModel.py	85.84% <75.00%> (-0.06%)	⬇️

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