POC unix sockets for IPC as opposed to fd3

[lmorg]

Discussion:

• https://news.ycombinator.com/item?id=34322324

Reference material:

• https://en.wikipedia.org/wiki/Unix_domain_socket
• https://stackoverflow.com/questions/10037086/so-peercred-vs-scm-credentials-why-there-are-both-of-them

Reference code:

• https://blog.jbowen.dev/2019/09/using-so_peercred-in-go/
• https://github.com/toolmanorg/net-peercred
• https://github.com/joeshaw/peercred
• https://gist.github.com/joncfoo/acdd780e8347fd55273daa255039ba75