[7.x] Add the ability to makeMany (create many without saving)

[ahmedsayedabdelsalam]

when adding many records to a one to many relation I found that I had to use one of two methods

• createMany($models)
• saveMany($models)
  but each of them, execute count($models) queries

I found that I had to use the query builder insert method which takes an array of arrays and executes a single query but then I have to explicitly attach the foreign key first

so I thought what if there is a like (make) function but make a collection of instances instead of a single one and every instance has the parent id attached to it under the hood.

I used it in my project as a macro but I thought it could be useful.

public function orderTickets(string $email, int $ticket_quantity)
{
    $order = $this->orders()->create(['email' => $email]);

    $order->tickets()->insert($order->tickets()->makeMany(collect()->pad($ticket_quantity, []))->toArray());

    return $order;
}