Linux fixes for Pytorch linking

[thinkpractice]

This is my ongoing progress on fixing the Linux linker issues. I've changed the following:

• Use _GLIBCXX_USE_CXX11_ABI=1 to build pytorch and the swift package
• Changed all references to clang-18 to clang-17
• Commented out some projects that still have linker errors
• Added a basic c++ Pytorch example to investigate linker errors.

At some point the linker errors for the tests were resolved but now I'm getting them back. Will investigate tomorrow what has happened.

[thinkpractice]

Added examples back, only MNISTExample works, the other two crash. Also added ATenCXXDoctest back to the build. Not sure what this is meant to do but at least it runs with status SUCCESS!.

[thinkpractice]

@pedronahum by applying some git "dark magic" 🤣 I did a hard reset to your main branch. I've add a couple of convenience shell scripts to make local development without docker easier and I've added a .devcontainer for vscode that helps developing in the container. Debugging doesn't work completely yet, need to investigate.

[thinkpractice]

@pedronahum just merged your upstream main branch and will tests if everything still works. Then I will push the changes here. If you prefer I can make another PR instead and we close this one.

Also tried building with rocm. This works, but only have been using cpu until now. Will investigate what we need for gpu support

UPDATE: just merged upstream/main and pushed the changes here

[pedronahum]

Amazing @thinkpractice!!