Add stopPropagation() method to policies

[ScorpioT1000]

example:

    $policy = (new Policy\To\FormatDateTime(['format' => "Y_m_d_H_i_s"]))
        ->stopPropagation()->inside([
        // ...
    ]);

doctrine-orm-transformations/src/Annotations/Annotation.php

Line 29 in 3fb41c2

public $propagating = true;