impr: Add player repeat and shuffle, play artist and playlist. Code optimization.

MusicBot/database/guild.py

@@ -8,6 +8,8 @@ class Guild(TypedDict, total=False):
     is_stopped: bool
     allow_explicit: bool
     allow_menu: bool
+    shuffle: bool
+    repeat: bool
 
 class ExplicitGuild(TypedDict):
     _id: int
@@ -17,4 +19,6 @@ class ExplicitGuild(TypedDict):
     current_player: int | None
     is_stopped: bool  # Prevents the `after` callback of play_track
     allow_explicit: bool
-    allow_menu: bool  # Is /toggle menu command available
+    allow_menu: bool  # /toggle menu is only available if there's only one user in the voice chat.
+    shuffle: bool
+    repeat: bool