Allow specifying authentication salt as an optional argument

[Hequin0x]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 35.71429% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.41%. Comparing base (e07b356) to head (cdb6421).

Files with missing lines	Patch %	Lines
src/formatters/output_formatter.rs	0.00%	8 Missing ⚠️
src/commands/generate.rs	0.00%	3 Missing ⚠️
src/generators/authentication_generator.rs	80.00%	2 Missing ⚠️
src/renderers/authentication.rs	0.00%	2 Missing ⚠️
src/api/livebox_client.rs	50.00%	1 Missing ⚠️
src/renderers/dhcp.rs	0.00%	1 Missing ⚠️
src/renderers/gpon.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   45.79%   46.41%   +0.62%     
==========================================
  Files          11       11              
  Lines         321      321              
==========================================
+ Hits          147      149       +2     
+ Misses        174      172       -2     

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