Implement promiseAll(promises) function that works like native Promise.all().

Requirements:

• Takes an array of promises
• Returns a promise with an array of all results
• If at least one promise is rejected - the whole promise rejects
• Results must be in the same order as input promises
• Must handle empty array (return [])
• DO NOT use built-in Promise.all()

Example:

const results = await promiseAll([
  Promise.resolve(1),
  Promise.resolve(2),
  Promise.resolve(3)
]);
// results = [1, 2, 3]