Add anthropic multimodal option

[rchan26]

Fix #104 with notebook example

[review-notebook-app]

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Codecov Report

Attention: Patch coverage is 34.88372% with 28 lines in your changes missing coverage. Please review.

Project coverage is 63.35%. Comparing base (c6ee30c) to head (b7209cc).

Files with missing lines	Patch %	Lines
src/prompto/apis/anthropic/anthropic_utils.py	33.33%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
- Coverage   63.91%   63.35%   -0.57%     
==========================================
  Files          40       40              
  Lines        2245     2287      +42     
==========================================
+ Hits         1435     1449      +14     
- Misses        810      838      +28     

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