Add group_to_single_imports option to single_import_per_statement

See codeigniter4/CodeIgniter4#6519

Author: paulbalandan

src/CodeIgniter4.php

@@ -501,8 +501,7 @@ public function __construct()
             'single_blank_line_at_eof'           => true,
             'single_blank_line_before_namespace' => true,
             'single_class_element_per_statement' => ['elements' => ['const', 'property']],
-            'single_import_per_statement'        => true,
-            'single_line_after_imports'          => true,
+            'single_import_per_statement'        => ['group_to_single_imports' => true],            'single_line_after_imports' => true,
             'single_line_comment_spacing'        => true,
             'single_line_comment_style'          => ['comment_types' => ['asterisk', 'hash']],
             'single_line_throw'                  => false,