style: add no-unused-imports rule

Author: ecastro98

.php_cs.dist

@@ -20,6 +20,7 @@ return PhpCsFixer\Config::create()
         'no_multiline_whitespace_before_semicolons' => true,
         'no_superfluous_elseif' => true,
         'no_superfluous_phpdoc_tags' => true,
+        'no_unused_imports' => true,
         'no_useless_else' => true,
         'no_useless_return' => true,
         'ordered_imports' => true,