Create cog disabling API (#4043)

* create cog disbale base

* Because defaults...

* lol

* announcer needs to respect this

* defaultdict mishap

* Allow None as guild

- Mostly for interop with with ctx.guild

* a whitespace issue

* Apparently, I broke this too

* Apply suggestions from code review

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

* This can probably be more optimized later, but since this is a cached value, it's not a large issue

* Report tunnel closing

* mod too

* whitespace issue

* Fix Artifact of prior method naming

* these 3 places should have the check if i understood it correctly

* Announce the closed tunnels

* tunnel oversight

* Make the player stop at next track

* added where draper said to put it

* Apply suggestions from code review

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>

Co-authored-by: jack1142 <6032823+jack1142@users.noreply.github.com>
Co-authored-by: Drapersniper <27962761+drapersniper@users.noreply.github.com>

redbot/core/utils/tunnel.py

@@ -1,3 +1,4 @@
+import asyncio
 import discord
 from datetime import datetime
 from redbot.core.utils.chat_formatting import pagify
@@ -175,6 +176,19 @@ class Tunnel(metaclass=TunnelMeta):
     # Backwards-compatible typo fix (GH-2496)
     files_from_attatch = files_from_attach
 
+    async def close_because_disabled(self, close_message: str):
+        """
+        Sends a mesage to both ends of the tunnel that the tunnel is now closed.
+
+        Parameters
+        ----------
+        close_message: str
+            The message to send to both ends of the tunnel.
+        """
+
+        tasks = [destination.send(close_message) for destination in (self.recipient, self.origin)]
+        await asyncio.gather(*tasks, return_exceptions=True)
+
     async def communicate(
         self, *, message: discord.Message, topic: str = None, skip_message_content: bool = False
     ):