net: refactor overloaded argument handling

• Destructure arguments when it will always be converted into an array
• Rename some args[i] for readability
• Use Socket.prototype.connect.call instead of .apply when the number of arguments is certain(returned by normalizeArgs)
• Make normalizeArgs return either [options, null] or [options, cb] (the second element won't be undefined anymore) and avoid OOB read
• Refactor Server.prototype.listen, separate backlogFromArgs and options.backlog, avoid making options a handle, comment the overloading process

Pending benchmark results...

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

net