[just-rotate-right] Rotate array elements to the right

It would be helpful to introduce a method to rotate array elements. Something this simple would do the trick:

### Function definition
```ts
function rotateRight(arr: T[], k: number): T[] {
const mod = k % arr.length;
return arr.slice(-mod).concat(arr.slice(0, -mod));
}
```

### Usage
```ts
rotateRight([1, 2, 3], 1) // -> [3, 1, 2]
rotateRight([1, 2, 3], -1) // -> [2, 3, 1]
rotateRight([1, 2, 3], 2) // -> [2, 3, 1]
```