Fix logging for streaming

[svilupp]

• Removed accidental INFO log in Anthropic's aigenerate
• Changed internal logging in streamcallback to use @debug when printing raw data chunks.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.66%. Comparing base (826fceb) to head (eed2678).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/streaming.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
- Coverage   91.66%   91.66%   -0.01%     
==========================================
  Files          46       46              
  Lines        4416     4415       -1     
==========================================
- Hits         4048     4047       -1     
  Misses        368      368              

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