feat: create a cached aligner

[nh13]

This avoids re-allocating the matrix every time

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.59%. Comparing base (c4e4bb6) to head (a44f400).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
.../scala/com/fulcrumgenomics/alignment/Aligner.scala	70.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1022      +/-   ##
==========================================
- Coverage   95.62%   95.59%   -0.03%     
==========================================
  Files         126      126              
  Lines        7378     7722     +344     
  Branches      490      501      +11     
==========================================
+ Hits         7055     7382     +327     
- Misses        323      340      +17     

Flag	Coverage Δ
unittests	95.59% <70.00%> (-0.03%)	⬇️

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