Add promise variant of `getSocket` method

[MasterOdin]

There's a promise variant of getPort and getPorts, there should then also be a promise variant of getSocket as well.

@eriktrom If this gets done, would you want to see both a getSocketPromise method as well as having getSocket be able to return a promise (assuming #168 is merged as that lays out the implementation pattern).

[eriktrom]

Yes, and Yes

Yes lets add a getSocketPromise and lets alias it to getSocket using the same idea from #168