Added gradio interface

[buntynitin]

Added a gradio ui on top of existing flow.
User can now run it either by cli or by running the gradio server.

[CheckerFlow]

Checked out the feature branch and tried to run the Gradio UI.
Works as expected:

Should be good for merging with main branch.

[virattt]

I love this idea.

Can we add support for:

• multiple models
• multiple agents

[buntynitin]

Implemented Features:

1. Workflow graph is generated dynamically and displayed in the UI without being saved.
2. All agents are selected by default.
3. Data validation errors are now shown as toast notifications, while other errors are displayed in the output.
4. HTML-based results have been introduced, providing more customization options.
5. No changes were made to the existing flow; a separate Gradio file was used for this implementation.

Future Scope:

1. API key management via the UI.

Note:

1. Gradio requires python versions >= 3.10. So bumped the version from 3.9 to 3.10 causing more changes in poetry.lock
2. The ordering of agents in the results is currently incorrect due to issues with the existing sorting implementation, which is also affecting the terminal output. I decided not to include the fix in this PR.