Provides an async-friendly pool data structure using tokio.
use std::io;
use ljprs_async_pool::AsyncPool;
async fn initializer_fn() -> Result<i32, io::Error> {
Ok(42)
}
let pool = AsyncPool::new(16, initializer_fn);
let guard = pool.get().await;
assert!(guard.is_ok());
assert_eq!(*(guard.unwrap()), 42);