Expose diagnostics for voice sockets

[Francessco121]

Debugging voice issues is currently very difficult with Discore. It's pretty much impossible to determine why exactly audio-playback skips, speeds up, or freezes without modifying Discore itself.

Users should be able to opt-into receiving diagnostic information from voice connections. With this information, users should be able to determine:

• If their application is sending voice data too slowly or too fast.
• If their application is not sending voice data consistently (causing breaks in the playback).
• If Discore is unable to send voice data consistently.
• If Discore is sending voice data too slowly.

Information that needs to be exposed (note: this list is incomplete):

• Frame send-rate (to determine consistency issues)
• Whether the socket is trying to catch up (to determine consistency issues)
• When the socket skips a frame (to determine if the application isn't giving Discore data quick enough)