[Mutes] Add ability to send DMs on mute/unmute (#4563)

* handle manual mutes/unmutes

Doing this in the Web-Editor is painful. Let's switch to VSC.

* embed version

* non embed

* config stuff

* testing done

* wow black

* Few things before I start local testing

* Fix new lines

* Make messages not depend on modlog

* Yay voicemutes

* black+import

* what is your ducking problem vscode

* adress review

* this is driving me mad

* Check the config in `_send_dm_notification` to avoid code repetition

* Fix incorrect type hints

* Remove no longer needed line changes

* Remove unused function

* Update the type hints from commit 946299 in the MixinMeta too

* Fixed wrong variable being passed to the method and ensure DMs aren't sent when we couldn't get the member object

* They call me dumb for a reason

* Stop overriding variable with duration + various formatting tweaks

* :(

* We need to differ between voice and text in two places, interesting...

* Show info about no reason provided in embed

* Apparently, the `reason` can also be an empty string :|

* Update redbot/cogs/mutes/mutes.py

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

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

redbot/cogs/mutes/voicemutes.py

@@ -1,10 +1,11 @@
-from typing import Optional, Tuple
+from typing import Optional, Tuple, Union
 from datetime import timezone, timedelta, datetime
 from .abc import MixinMeta
 
 import discord
 from redbot.core import commands, checks, i18n, modlog
 from redbot.core.utils.chat_formatting import (
+    bold,
     humanize_timedelta,
     humanize_list,
     pagify,
@@ -143,6 +144,9 @@ class VoiceMutes(MixinMeta):
                         until=until,
                         channel=channel,
                     )
+                    await self._send_dm_notification(
+                        user, author, guild, _("Voice mute"), reason, duration
+                    )
                     async with self.config.member(user).perms_cache() as cache:
                         cache[channel.id] = success["old_overs"]
                 else:
@@ -216,6 +220,9 @@ class VoiceMutes(MixinMeta):
                         until=None,
                         channel=channel,
                     )
+                    await self._send_dm_notification(
+                        user, author, guild, _("Voice unmute"), reason
+                    )
                 else:
                     issue_list.append((user, success["reason"]))
         if success_list: