Add StandaloneLineRequiredParamFixer to spaces set

[TomasVotruba]

Adds StandaloneLineRequiredParamFixer and registers it in the spaces set.

Inspired by mautic/mautic#16607.

What it does

A public method carrying a #[Required] attribute or an @required docblock is a dependency-injection point. Its parameter list grows over time; a one-line signature turns every added/removed dependency into a full-line git diff. The fixer puts one parameter per line so the diff stays on the single dependency that changed.

Example

 final class SomeController
 {
     #[Required]
-    public function autowireDependencies(FormModel $formModel, SubmissionModel $submissionModel): void
+    public function autowireDependencies(
+        FormModel $formModel,
+        SubmissionModel $submissionModel
+    ): void
     {
     }
 }

Docblock form is matched too:

     /**
      * @required
      */
-    public function autowireDependencies(FormModel $formModel, SubmissionModel $submissionModel): void
+    public function autowireDependencies(
+        FormModel $formModel,
+        SubmissionModel $submissionModel
+    ): void

Skips

• non-public methods (private/protected #[Required])
• methods without a #[Required]/@required marker
• methods with no parameters