Model scenarios for create/update actions

[SOHELAHMED7]

Resolve below TODO:

namespace cebe\yii2openapi\lib\items;
 
final class FractalAction extends BaseObject

public function getTemplate():?string
    {
        //@TODO: Model scenarios for create/update actions
        return $this->templateFactory()->getTemplate();
    }

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Part of #10

and

Part of cebe#180