Add a DevContainer setup to GPU-EVM

[IliaMManolov]

Almost works, I am hitting that annoying "can't find boost/asio.hpp" bug again.

Benefits:

• Unified environment for working on and building GPU-EVM, shouldn't ever have a "works on my machine" funny business.
• Can share Dockerfile with CI/CD for even less "works on my machine"ness
• Can painlessly update CUDA (huge)
• Can somewhat easily update Ubuntu

How to run:

1. Checkout the devcontainer_setup branch
2. Install the Nvidia Container toolkit on your host machine
3. Install the DevContainers extension in VSCode/Cursor
4. Open the project in VSCode/Cursor -> Open Command Palette (Cmd+Shift+P / F1) -> Dev Containers: Reopen in Container
5. Wait for it to set up, you should be able to open a plain Bash terminal
6. Build using the standard Command Palette -> CMake Build

TODO:

• Fix the Boost asio include path issue
• Alternative shells (or at least fish) seem to be broken because Runtime path is not available. I have an idea of how to fix it. Would make developing inside the container not suck as default bash is a bit too old-school for me.
• Need to add cargo to make the rust extension happy
• Need to pass git credentials inside. Currently if you make changes you need to exit the container to commit them which sucks.
• ???

[IliaMManolov]

Additional TODO: Remove the setup shell script, it's not used