chacha20-poly1305 internals: Use InputTooLongError for return types.

[briansmith]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.17%. Comparing base (555d598) to head (21de773).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aead/chacha20_poly1305.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2206      +/-   ##
==========================================
+ Coverage   97.16%   97.17%   +0.01%     
==========================================
  Files         158      158              
  Lines       20256    20258       +2     
  Branches      454      454              
==========================================
+ Hits        19682    19686       +4     
  Misses        469      469              
+ Partials      105      103       -2     

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