Using UDS for communication in debugger

IIUC, the current debugpyClient communicates with debugpy via a TCP connection. However, due to security limitations in our use case, we are unable to use network sockets for the communication.

I understand debugpy currently only supports TCP connections, but I have proposed an issue for debugpy to accept UDS as well([link](https://github.com/microsoft/debugpy/issues/1607)). If they are onboard with this, can we update ipykernel logic to use UDS instead of TCP? Or will there be any concerns there?

Start by tracing the ipykernel debugpyClient path that establishes its TCP connection, then review debugpy issue 1607 for UDS support and compatibility. Determine whether the external support is available and identify concerns in replacing TCP with UDS; done means a documented decision and, if supported, updated communication behavior.

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