[NFR]: Add the has() method for View

[TimurFlush]

Hello!

4.1.x: I propose to implement the has() method in Phalcon\Mvc\View\Simple and Phalcon\Mvc\View
5.x.x: I propose to implement the has() method in Phalcon\Mvc\ViewBaseInterface and Phalcon\Mvc\ViewInterface

In my opinion, sometimes it is important to check the existence of a template before render it.
I also checked the existence of this method in other known template engines:
Fenom : https://github.com/fenom-template/fenom/blob/fc188a582229c7735df1bb584eb268548a957f46/src/Fenom.php#L1030
Blade: https://github.com/laravel/framework/blob/d25d45b389aac2492e923a8adf885095474f8d2f/src/Illuminate/View/Factory.php#L262
Smarty: https://github.com/smarty-php/smarty/blob/4b29dfce1195b04ee337d943a9c539c8d8eb5690/libs/Smarty.class.php#L721
Twig: https://github.com/twigphp/Twig/blob/d291382a24d6c05b5126c1e1e5abeadddd82d7b2/src/Loader/FilesystemLoader.php#L145

The need to implement this method speaks for itself.

I'm waiting for your feedback.
Thanks

[ruudboon]

Closing this and opening it for voting. #14608 (comment)