Add multimodal prompting with OpenAI and Azure OpenAI

[rchan26]

• Fix Add OpenAI multimodal prompting #68
• Added notebook examples for both Azure OpenAI and OpenAI APIs for Add multimodal example for OpenAI #72

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Codecov Report

Attention: Patch coverage is 16.00000% with 42 lines in your changes missing coverage. Please review.

Project coverage is 63.91%. Comparing base (771be5f) to head (b3a970a).

Files with missing lines	Patch %	Lines
src/prompto/apis/openai/openai_utils.py	13.63%	38 Missing ⚠️
src/prompto/apis/gemini/gemini_utils.py	0.00%	2 Missing ⚠️
src/prompto/apis/vertexai/vertexai_utils.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
- Coverage   64.92%   63.91%   -1.01%     
==========================================
  Files          40       40              
  Lines        2201     2245      +44     
==========================================
+ Hits         1429     1435       +6     
- Misses        772      810      +38     

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