bugfix for pargen load_data to eval all fields in hit dict, specify dtype when init lh5 objects in evt and support subtables in skm

[ggmarshall]

No description provided.

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (a0a4400) 22.75% compared to head (0b569e9) 22.79%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/pygama/pargen/utils.py	0.00%	8 Missing ⚠️
src/pygama/math/histogram.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #554      +/-   ##
==========================================
+ Coverage   22.75%   22.79%   +0.04%     
==========================================
  Files          42       42              
  Lines        8117     8119       +2     
==========================================
+ Hits         1847     1851       +4     
+ Misses       6270     6268       -2     

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