Derive Macro Queue 

#[derive(Queue)]
{
    // Attributes available to this derive:
    #[oxanus]
}

Generates impl for oxanus::Queue.

Example usage:

#[derive(Serialize, oxanus::Queue)]
#[oxanus(key = "my_queue")]
#[oxanus(concurrency = 2)]
#[oxanus(throttle(window_ms = 3, limit = 4))]
pub struct MyQueue;