Unix socket is expected to be encoded with `%2F`

Describe the bug

Node.js version:
18.15.0

OS version:
Ubuntu 20.4

Superagent version:
8.0.9

Description:
As we can see from line 728 of src/node/index.js superagent expects a unix socket address like /path/to/socket.sock to be formatted as %2Fpath%2Fto%2Fsocket.sock, to then separate the socket path from the actual url with a regular expression.

If the unix path is not formatted as required, an unclear error will be thrown:
Cannot read properties of null (reading '1')
which is caused by the regexr not being able to match the unix socket path.

Code to reproduce

await superagent .get('http+unix:///path/to/socket.sock/the/actual/url');

// will throw: Cannot read properties of null (reading '1')

It would be much easier to just skip this whole pattern matching and provide and option to directly pass the socket path.

await superagent.get('http://the/actual/url').socket('/path/to/socket.sock')

Checklist

• I have searched through GitHub issues for similar issues.
• I have completely read through the README and documentation.
• I have tested my code with the latest version of Node.js and this package and confirmed it is still not working.