TASK: Add documentation how work with psr responses in controller

[mhsdesign]

There was some confusion how to replace $this->response when modifying view results.

The suggested pattern now is more explicit instead of providing any form of helper like:

abstract class ResponseInformationHelper
{
    public static function response(Response|StreamInterface $response): Response
    {
        return $response instanceof Response ? $response : new Response(body: $response);
    }
}

Instead this will be written explicitly:

$response = $this->view->render();
if (!$response instanceof Response) {
    $response = new Response(body: $response);
}
return $response
    ->withHeader('My-Header', 'foo');

Also this change inlines ActionController::renderView as the method signature is now really odd and unusable or understandable from the outside. $this->view should instead be used instead like when also assigning variables.

Related changes that lead to the new patterns:

• !!! FEATURE: ViewInterface returns PSR StreamInterface #3286
• !!! FEATURE: Dispatcher psr overhaul #3311

Upgrade instructions

Review instructions

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[mhsdesign]

ping @kitsunet ;)