add functionality for return indexed

e.g. add option to return keys { extend: true }, and we can get the result

// from 
[{ one: 22, five: 5 }]

// to
[
  {
    value: { one: 22, five: 5 },
    index: 3
  }
]

this is necessary so that later it was not necessary to restart the search function by index if you need to work with reactive data