Change Cron worker API and update all examples

[tyt2y3]

schedule is now part of Worker definition:

#[derive(Debug, Serialize, Deserialize, oxanus::Worker)]
#[oxanus(cron(schedule = "*/5 * * * * *", queue = QueueOne))]
struct TestWorker {}

impl TestWorker {
    async fn process(&self, _: &oxanus::Context<WorkerState>) -> Result<(), WorkerError> {
        tokio::time::sleep(std::time::Duration::from_secs(1)).await;
        Ok(())
    }
}

it can be registered just like a normal worker:

let config = oxanus::Config::new(&storage).register_worker::<TestWorker>();

cron worker with dynamic queues is still supported with the old API:

#[derive(Debug, Serialize, Deserialize, oxanus::Worker)]
#[oxanus(max_retries = 3, retry_delay = 0)]
#[oxanus(cron(schedule = "*/10 * * * * *"))]
struct TestCronWorker {}

let config = oxanus::Config::new(&storage).register_cron_worker::<TestCronWorker>(QueueDynamic(2));

[reneklacan]

❤️