Clean up non-Player CommandSender implementations

src/main/java/net/minestom/server/command/CommandSender.java

@@ -22,7 +22,7 @@ public interface CommandSender extends PermissionHandler, Audience {
      * @deprecated Use {@link #sendMessage(Component)}
      */
     @Deprecated
-    void sendMessage(@NotNull String message);
+    default void sendMessage(@NotNull String message) { this.sendMessage(Component.text(message)); }
 
     /**
      * Sends multiple raw string messages.

src/main/java/net/minestom/server/command/ConsoleSender.java

@@ -27,11 +27,6 @@ public class ConsoleSender implements CommandSender {
         LOGGER.info(PlainComponentSerializer.plain().serialize(message));
     }
 
-    @Override
-    public void sendMessage(@NotNull String message) {
-        LOGGER.info(message);
-    }
-
     @NotNull
     @Override
     public Set<Permission> getAllPermissions() {

src/main/java/net/minestom/server/command/ServerSender.java

@@ -1,6 +1,8 @@
 package net.minestom.server.command;
 
 import net.minestom.server.command.builder.CommandContext;
+import net.kyori.adventure.audience.Audience;
+import net.minestom.server.command.builder.Arguments;
 import net.minestom.server.permission.Permission;
 import org.jetbrains.annotations.NotNull;
 
@@ -11,18 +13,14 @@ import java.util.Set;
 /**
  * Sender used in {@link CommandManager#executeServerCommand(String)}.
  * <p>
- * Be aware that {@link #sendMessage(String)} is empty on purpose because the purpose
- * of this sender is to process the data of {@link CommandContext#getReturnData()}.
+ * Although this class implemented {@link CommandSender} and thus {@link Audience}, no
+ * data can be sent to this sender because it's purpose is to process the data of
+ * {@link CommandContext#getReturnData()}.
  */
 public class ServerSender implements CommandSender {
 
     private final Set<Permission> permissions = Collections.unmodifiableSet(new HashSet<>());
 
-    @Override
-    public void sendMessage(@NotNull String message) {
-        // Empty on purpose
-    }
-
     @NotNull
     @Override
     public Set<Permission> getAllPermissions() {