Introduce sendCommand API method (#5582)

* Introduce sendCommand API method

* Ensure Geyser/extension commands are caught

* Remove handleCommand from the translator, use executeCommand directly

* Relocate the command handling logic again, using the new one this time

* Fix up the javadocs

* Rename back to sendCommand, rename the packet method

* Also change the bedrock command translator

* And another one...

* Ensure we forward commands directly when catching exceptions during command execution

---------

Co-authored-by: onebeastchris <github@onechris.mozmail.com>

api/src/main/java/org/geysermc/geyser/api/connection/GeyserConnection.java

@@ -107,6 +107,13 @@ public interface GeyserConnection extends Connection, CommandSource {
      */
     void openQuickActions();
 
+    /**
+     * Sends a command as if the player had executed it.
+     *
+     * @param command the command without the leading forward-slash
+     */
+    void sendCommand(String command);
+
     /**
      * @param javaId the Java entity ID to look up.
      * @return a {@link GeyserEntity} if present in this connection's entity tracker.