Add a tool to get rid of stale orders from DB

[ro31337]

There are plenty of stale orders in Firebase database:

We don't need them anymore, most of them are stale. "Orders table" should be lean, so it won't load the app too much, especially in regions with high concentration of people willing to order a ride.

Add a tool to copy stale orders from orders "table" to staleOrders "table".

It's recommended to run this script in production every 1-3 days.