Implement a function promiseAll(promises) that mimics the behavior of Promise.all().

The function:

• Takes an array of values or promises.
• Returns a single Promise that:
  • Resolves with an array of resolved values (in the same order).
  • Resolves immediately with [] if the input array is empty.
  • Rejects immediately if any promise rejects, with the reason of the first rejection.
  • Rejects if the argument is not an array.

This is commonly used to run multiple asynchronous operations concurrently and wait for all results before proceeding.

Example

// Resolved example
const p0 = Promise.resolve(3);
const p1 = 42;
const p2 = new Promise((resolve) => setTimeout(() => resolve("foo"), 100));

await promiseAll([p0, p1, p2]); 
// [3, 42, "foo"]

// Rejection example
const p0 = Promise.resolve(30);
const p1 = new Promise((_, reject) => setTimeout(() => reject("An error occurred!"), 100));

try {
  await promiseAll([p0, p1]);
} catch (err) {
  console.log(err); // "An error occurred!"
}