add trans support

[danielnachun]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 84.82143% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.54%. Comparing base (9287c0f) to head (7741ae4).

Files with missing lines	Patch %	Lines
R/fineMappingPipeline.R	85.55%	26 Missing ⚠️
R/jointSpecification.R	72.41%	24 Missing ⚠️
R/GenotypeHandle.R	85.55%	13 Missing ⚠️
R/twasWeightsPipeline.R	91.55%	13 Missing ⚠️
R/genotypeIo.R	76.31%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
- Coverage   85.61%   85.54%   -0.07%     
==========================================
  Files          54       54              
  Lines       14797    15134     +337     
==========================================
+ Hits        12668    12946     +278     
- Misses       2129     2188      +59     

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