add fine-mapping CV support and other features

[danielnachun]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 77.10583% with 106 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.28%. Comparing base (41aec1d) to head (6f1c3dc).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
R/fineMappingPipeline.R	68.67%	78 Missing ⚠️
R/QtlDataset.R	68.75%	10 Missing ⚠️
R/regularizedRegressionWrappers.R	87.32%	9 Missing ⚠️
R/twasWeightsPipeline.R	91.57%	8 Missing ⚠️
R/fineMappingWrappers.R	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #532      +/-   ##
==========================================
- Coverage   85.54%   85.28%   -0.26%     
==========================================
  Files          54       54              
  Lines       15134    15552     +418     
==========================================
+ Hits        12946    13264     +318     
- Misses       2188     2288     +100     

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