Add `PlayerTeamDeathEvent` and implementations

src/main/java/emu/grasscutter/server/event/player/PlayerTeamDeathEvent.java

+package emu.grasscutter.server.event.player;
+
+import emu.grasscutter.game.entity.EntityAvatar;
+import emu.grasscutter.game.player.Player;
+import emu.grasscutter.server.event.types.PlayerEvent;
+import lombok.Getter;
+
+/**
+ * This event is invoked when the ENTIRE TEAM dies.
+ * To listen for one player death, use {@link emu.grasscutter.server.event.entity.EntityDeathEvent}.
+ */
+public final class PlayerTeamDeathEvent extends PlayerEvent {
+    @Getter private final EntityAvatar selectedAvatar;
+
+    public PlayerTeamDeathEvent(Player player, EntityAvatar selectedAvatar) {
+        super(player);
+
+        this.selectedAvatar = selectedAvatar;
+    }
+}
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