Given the elements provided in the world, this function generates a dataset
with info about the beepers present in the world. This function is called
from generar_mundo().
Valor
A tibble with as many rows as cells with beepers in the world and 5
  columns: x and y for the coordinates of the cell, cell
  is the number of the cell counting as cell number 1 the cell in the bottom
  left corner and going upwards by row (meaning cell number 2 would be the
  cell in coordinates x=2 and y=1), n the number of beepers in this
  cell and moment the moment in which this state of the world
  corresponds to.
