[TEST] sam record

[marehr]

Several fixes to the sam record test.

• Use ""_cigar literal
• reference_id is normally a std::optional<int>
• Add some comments to easier identify what the members are.

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[codecov]

Codecov Report

Merging #2830 (8dcc0a3) into master (c6decd3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2830   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files         277      277           
  Lines       10963    10963           
=======================================
  Hits        10785    10785           
  Misses        178      178           

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