/// A trait for building parallel asynchronous steps.
pubtraitAsyncParallelStepBuilderTrait{/// sets the number of workers to use for parallel processing.
/// Defaults to 1.
/// # Parameters
/// - `processor_concurrency_size`: The number of workers to use for parallel processing.
/// # Returns `Self`
/// The modified builder instance.
fnworkers(self, processor_concurrency_size:usize)->Self;}