Feature request: support NREPL running over a Unix domain socket

After years of fighting with .nrepl-port not always getting set, REPLs competing for the same port, etc., I have switched to Unix domain sockets for my nrepl servers. I can put them in the project directory so they don't collide, and I can give them all the same name so they are easily discoverable.

This works great, except clj-nrepl-eval only supports TCP/IP ports. Would it be hard to add support for Unix domain sockets?

Start by locating the clj-nrepl-eval entry point and reading how it currently connects to NREPL over TCP/IP. Check for existing connection tests, then define done as being able to connect to and evaluate against an NREPL server addressed by a Unix domain socket without regressing TCP/IP support.

Written by the indexing model from the issue text.