Add support for video files

[dishitpala]

To access the videos, cloudinary adds /videos/uploads after cloud name
Here: https://github.com/junaidbhura/auto-cloudinary/blob/master/inc/class-core.php#L115

We can check file type and based on that, we can append path to URL

// Add support for the video file type.
if ( ! empty( $args['file_type'] ) && 'video' === $args['file_type'] ) {
	$url .= '/video/upload';
}