Upstream websocket lambda

[mohanraj-u]

Issue #, if available:
#738
#738 (comment)

Description of changes:
-- Added support for local websocket deployment using FASTAPI
-- Refactored existing websocket implementation (see attached document)
Websocket Refactoring.pdf
-- Consistency for all Websocket messages to be JSON format

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[mohanraj-u]

-- Any additional changes needed to complete this PR?

[statefb]

@mohanraj-u Thank you for your contribution and implementing this feature request! I appreciate the work you've put into supporting local WebSocket development and debugging.

At the moment, our team is occupied with other priority tasks, so we may not be able to review this PR immediately. While local WebSocket development support would be valuable, it's not currently at the top of our priority list.

That said, we do recognize the importance of improving the development experience, especially for WebSocket functionality. We'll try to review this when our current workload permits.

As mentioned in our contribution guidelines, for substantial feature enhancements like this, we recommend discussing implementation approaches and details in the issue thread before proceeding with development work. This helps ensure smoother review and integration of PRs.

But, thanks again for your understanding and contribution to improving the project!