feat: started working on vision

[ErikBjare]

Fixes https://github.com/ErikBjare/gptme/issues/50

Prerequisite for:

• https://github.com/ErikBjare/gptme/issues/51
• https://github.com/ErikBjare/gptme/issues/52

TODO

• [x] Add Anthropic support
• [x] Add OpenAI support
• [ ] Add test
• [ ] Make it work for image-URLs
• [ ] Make it work with other tools

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.47368% with 14 lines in your changes missing coverage. Please review.

Project coverage is 78.12%. Comparing base (b25e576) to head (d52406e).

Files	Patch %	Lines
gptme/cli.py	83.33%	5 Missing :warning:
gptme/tools/__init__.py	64.28%	5 Missing :warning:
gptme/message.py	89.47%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   78.04%   78.12%   +0.07%     
==========================================
  Files          40       40              
  Lines        2514     2555      +41     
==========================================
+ Hits         1962     1996      +34     
- Misses        552      559       +7     

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