[CodingStyle] Add ManualJsonStringToJsonEncodeArrayRector

[TomasVotruba]

-$someJsonAsString = '{"role_name":"admin","numberz":{"id":"10"}}';

+$data = [
+    'role_name' => 'admin',
+    'numberz' => ['id' => '10']
+];
+$someJsonAsString = json_encode($data);

This rule would not be possible without @spaceflow-app sponsor, thank you ❤️