[WIP] attempting fix for ws protocol

[maxtheman]

📝 Summary

Fork of https://github.com/marimo-team/marimo/pull/2875/files with the same intention.

I think all that was needed was to forward the WebSocket connection directly to the Proxied Starlet app Instead of trying to Create a new WebSocket connection.

These tests pass, but I haven't yet had a chance to try it in a production app just to validate. I think it would also be handy to add HTTPS testing since that caused the original error.

🔍 Description of Changes

Adds ProxyMiddleWare and proxies mpl starlette app.

📋 Checklist

• [x ] I have read the contributor guidelines.
• [ x] For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• [ x] I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

@mscolnick

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