Function run_batch_apply 

pub fn run_batch_apply(
    input_dir: &Path,
    preset_path: &Path,
    output_dir: &Path,
    recursive: bool,
    quality: u8,
    format: Option<OutputFormat>,
    suffix: Option<&str>,
    jobs: usize,
    skip_errors: bool,
    use_gpu: bool,
) -> BatchSummary

Run batch-apply: apply a preset to all images in a directory, in parallel.