Feature rework reader ops

[teamjorge]

• Add Close methods to Stub and StubGroup.
• Add CloseAllStubs to close []StubGroup.
• Remove closing of reader in parser.
• Update examples.
• Update docstrings to indicate nil Ticks mean EOF

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.50%. Comparing base (ebfac11) to head (315c19d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   99.48%   99.50%   +0.01%     
==========================================
  Files          15       15              
  Lines         390      402      +12     
==========================================
+ Hits          388      400      +12     
  Misses          1        1              
  Partials        1        1              

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