Use Converse API for Bedrock provider

[richet]

What this does

• Removes the use of the Invoke endpoint
• Opens up the use of most of the Bedrock models instead of just having Anthropic.
• Allows for document uploads on endpoints that dont support it via the Invoke API. e.g. claude-3-haiku

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation
• Performance improvement

Scope check

• I read the Contributing Guide
• This aligns with RubyLLM's focus on LLM communication
• This isn't application-specific logic that belongs in user code
• This benefits most users, not just my specific use case

Quality check

• I ran overcommit --install and all hooks pass
• I tested my changes thoroughly
• I updated documentation if needed
• I didn't modify auto-generated files manually (models.json, aliases.json)

API changes

• Breaking change
• New public methods/classes
• Changed method signatures
• No API changes

Related issues

[crmne]

Adding Converse API is a great idea but this PR has significant issues:

1. No tests!
2. Code complexity
3. It doesn't follow the lead of the other providers in terms of method names, modules, etc.
4. Overcommit was not installed

[richet]

@crmne Several changes made per your comments. Well tested and ready for review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.57%. Comparing base (4ff2231) to head (2d460e2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #377   +/-   ##
=======================================
  Coverage   84.57%   84.57%           
=======================================
  Files          37       37           
  Lines        1932     1932           
  Branches      499      499           
=======================================
  Hits         1634     1634           
  Misses        298      298           

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[crmne]

This is a big patch @richet so thank you for the effort but there are still significant changes needed:

I still see that the organization of the code, especially in chat.rb, doesn't respect the organization of the other providers. There are a ton of methods there that belong in other modules in a provider implementation. Check the OpenAI provider for an example of what belongs where. I'll resume reviewing it when that's done.

Thank you again for the monumental effort.

[richet]

@crmne Thanks for the review and pushing me to clean this up a bit more. I renamed and cleaned up a lot of the methods to a point where I think its close to what you have in OpenAI.