AI UI Designer & Tool Generation Feature

[synapsecode]

PR Description

This PR includes the work done on AI UI Designer and Tool Generation Feature.
Tool Generation is fully complete.
AI UI Designer works but needs multiple system prompt optimizations such as:

• narrowing down to a limited list of supported widgets for better accuracy
• SDUI Error Handling and fallback (need to manually modify Stac package by forking)
• improving the system prompt to generate a better UI on the first try using layout knowledge
• handling cases where SDUI output is too big and model output is getting clipped

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: TBD

OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux