Add an entrypoint to SamSource for bytes of SAM/BAM/CRAM

[clintval]

[codecov-commenter]

Codecov Report

Merging #760 (de512c4) into master (70aab13) will increase coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head de512c4 differs from pull request most recent head 813e48f. Consider uploading reports for the commit 813e48f to get more accurate results

@@           Coverage Diff           @@
##           master     #760   +/-   ##
=======================================
  Coverage   95.47%   95.47%           
=======================================
  Files         114      114           
  Lines        6733     6740    +7     
  Branches      429      422    -7     
=======================================
+ Hits         6428     6435    +7     
  Misses        305      305           

Flag	Coverage Δ
unittests	95.47% <100.00%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
.../scala/com/fulcrumgenomics/bam/api/SamSource.scala	96.42% <100.00%> (+1.19%)	:arrow_up:

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[clintval]

Would you be willing to do a re-review?