input: Write a python function to get a list of all actors in the database.
  assert get_all_actors_in_database() == [(1, 'Actor 1', 1), (2, 'Actor 2', 2)]
  assert get_all_actors_in_database() == [(1, 'Actor 1', 1), (2, 'Actor 2', 1), (3, 'Actor 3', 2)]
  assert get_all_actors_in_database() == [(1, 'Actor 1', 1)]
output: def get_all_actors_in_database():
      import sqlite3
      connection = sqlite3.connect('database.db')
      cursor = connection.cursor()
      cursor.execute("SELECT * FROM actors")
      actors = cursor.fetchall()
      connection.close()
      return actors