Async Filter

Implement an async version of Array.filter that filters items with an async predicate.

Requirements:

• Implement asyncFilter that takes an array and async predicate function
• Test each item with the predicate
• Return only items where predicate returns true
• Maintain original order

Example:

const numbers = [1, 2, 3, 4, 5];
const isEven = async (n) => n % 2 === 0;

asyncFilter(numbers, isEven).then(result => {
  console.log(result); // [2, 4]
});