[feat] Add a reset method to ReflectiveBuilder

[nh13]

This allows ReflectiveBuilder to be re-used to build multiple instances.

[codecov-commenter]

Codecov Report

Merging #82 (25bb9f1) into main (9372c55) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   93.46%   93.60%   +0.14%     
==========================================
  Files          28       28              
  Lines         887      891       +4     
  Branches       70       67       -3     
==========================================
+ Hits          829      834       +5     
+ Misses         58       57       -1     

Flag	Coverage Δ
unittests	93.60% <100.00%> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
...umgenomics/commons/reflect/ReflectiveBuilder.scala	92.42% <100.00%> (+2.10%)	⬆️

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