APIDash AI Request Feature Implementation

[synapsecode]

PR Description

This PR is to add the AI Request feature to the API Dash application.
The AI Request feature is a feature that enables LLM API usage directly on the platform just like HTTP or GraphQL Requests

Additionally, this serves as the base foundation for all kinds of AI/LLM integrations within the APIDash application

The entire code is written in a very extensible and easy to understand way.

Demo Video

AI_REQUESTS_DEMO.mp4

Still a Work in Progress.

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run the tests (flutter test) and all tests are passing

Added/updated tests?

We encourage you to add relevant test cases.

• Yes
• No, and this is why: Still pending, need a lot of help in adding test cases

OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux