aes-gcm: Separate long AAD case from short AAD case.

[briansmith]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 96.61%. Comparing base (f03a371) to head (3bc9c35). :warning: Report is 231 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2491   +/-   ##
=======================================
  Coverage   96.60%   96.61%           
=======================================
  Files         180      180           
  Lines       21820    21831   +11     
  Branches      539      541    +2     
=======================================
+ Hits        21080    21091   +11     
  Misses        623      623           
  Partials      117      117           

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