Move HelpCommand under Console.

This it's available in the standalone package.

src/Command/HelpCommand.php

@@ -14,7 +14,7 @@ declare(strict_types=1);
  * @since         3.6.0
  * @license       https://opensource.org/licenses/mit-license.php MIT License
  */
-namespace Cake\Command;
+namespace Cake\Console\Command;
 
 use ArrayIterator;
 use Cake\Console\Arguments;

src/Console/CommandRunner.php

@@ -16,8 +16,8 @@ declare(strict_types=1);
  */
 namespace Cake\Console;
 
-use Cake\Command\HelpCommand;
 use Cake\Command\VersionCommand;
+use Cake\Console\Command\HelpCommand;
 use Cake\Console\Exception\MissingOptionException;
 use Cake\Console\Exception\StopException;
 use Cake\Core\ConsoleApplicationInterface;

tests/TestCase/Command/HelpCommandTest.php

@@ -14,7 +14,7 @@ declare(strict_types=1);
  * @since         3.5.0
  * @license       https://opensource.org/licenses/mit-license.php MIT License
  */
-namespace Cake\Test\TestCase\Command;
+namespace Cake\Test\TestCase\Console\Command;
 
 use Cake\Console\Command;
 use Cake\Core\Plugin;