Add Exception classes to RLL (Cog-Creators#115)

* Add RLL Specific errors and use them where appropriate

* update exception name to remove "exception" and keep naming consistent with others

* Add a Trace Logger class and use is across RLL to reduce log spam. (Cog-Creators#119)

* Add a Trace Logger class and use is across RLL to reduce log spam.

* formatting

* Tweaks

* fix wrong typehint

* change from debug to verbose

* update logs to not dump handled traceback on console

* add some logging around `lavalink.close()`

* add missing callback to tasks

* reorder for better logging

* Add RLL Specific errors and use them where appropriate

* conflict resolution + cleanup

lavalink/node.py

@@ -5,6 +5,7 @@
 import string
 import typing
 from collections import namedtuple
+from typing import KeysView, List, Optional, ValuesView
 
 import aiohttp
 from discord.backoff import ExponentialBackoff