Implement myEvery (Array.prototype.every)

Implement myEvery(arr, callback)

Write myEvery(arr, callback) that returns true only if every element satisfies callback.

Watch the empty-array edge case: mathematically (and in the spec), "every element of an empty set satisfies X" is vacuously true.

myEvery([2, 4, 6], (n) => n % 2 === 0); // true
myEvery([], (n) => false);              // true, vacuously