feat(blocks): Add AI/ML API support to LLM blocks (#9996)

Hi! Taking over this feature from the previous author in
[#9163](https://github.com/Significant-Gravitas/AutoGPT/pull/9163).
This PR continues the work to integrate AI/ML API support into LLM
blocks, addressing pending review comments and ensuring compatibility
with the current codebase.

I’ve reviewed and fixed the outstanding issues from the previous PR.
Kindly recheck the previous concerns — let me know if anything still
needs improvement.

Previous description:

> Changes 🏗️
> 
> - Added basic functionality to enable users to send requests to our
models.
> - Added instructions for users on how to use the AI/ML API in AutoGPT.
> 
> Checklist 📋
> For code changes:
> 
> - [x] I have clearly listed my changes in the PR description
> - [x] I have made a test plan
> - [x] I have tested my changes according to the test plan:
> - [x] The API key has been successfully added and saved to the user's
profile.
> - [x] Sending requests to each model provided by us, enabling users to
test them in a project with various max_tokens parameter values and
other configurations.

---------

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docs/content/index.md

@@ -66,6 +66,7 @@ The platform comes pre-integrated with cutting-edge LLM providers:
 
 - OpenAI
 - Anthropic
+- AI/ML API
 - Groq
 - Llama