feat(node/net): unix domain socket support

[cmorten]

Works towards:

• Need explanation, net node module return Not implemented error #1936
• node: Reenable test for "net" module #1635

Notes:

• Doesn't add windows support as blocked by Support for Named Pipes in Deno.connect deno#10244.
• Can't complete the full interface as there is outstanding work needed into Deno core.
• Improved test coverage for net again after lost from streams rework. Number of tests not passing so more work needed here.
• Couldn't get some path related tests passing - unsure if an issue with existing net/streams code or missing something in the new work here... but perhaps this is a reasonable start?
• Files changed looks daunting, but mostly a lot of Node compat tests. Unfortunately formatting updates find the main changes to some files, but hopefully straight-forward reading.

[CLAassistant]

All committers have signed the CLA.

[kt3k]

LGTM!

Great first pass for ipc conn support in node compat! Also thank you for enabling lot of compat test cases!

[kt3k]

Side note: Confirmed a basic use case working

In node (compat)

const net = require("net");
net.createServer((c) => { 
  c.on("data", (data) => { 
    console.log("on data", data.toString());
    c.end("HTTP/1.1 200 OK\nContent-type: text/html\n\nhello\n");
  });
}).listen("/path/to/my.socket", () => { 
  console.log("server linstening at localhost:3001");
});

Requesting it from deno

const hostname = "example.com"
const conn = await Deno.connect({ path: "/path/to/my.socket", transport: "unix" }); 
const blob = new Blob([`GET / HTTP/1.1
Host: ${hostname}

`]);
const writer = conn.writable.getWriter();
writer.write(new Uint8Array(await blob.arrayBuffer()));
conn.readable.pipeTo(Deno.stdout.writable);

[kt3k]

LGTM again

[kt3k]

This is helpful. Thanks!