[RFC] Support for asymetric property visibility

class AsymetricPropertyVisibility
{
    public private(set) string $foo;
}

$prophet = new Prophet();
$object = $prophet->prophesize(AsymetricPropertyVisibility::class);

$object->foo = 'yo';

$double = $object->reveal();

var_dump($double->foo);

Error: Cannot modify private(set) property Fixtures\Prophecy\AsymetricPropertyVisibility::$foo from scope Prophecy\Prophecy\ObjectProphecy