There are many ways a user might lose control of a space. Because we can't fake the crypto our system is built upon, the simplest solution to this is to have them create a new space that they do control and then ask us to copy the contents of the old space into the new.

Of course this doesn't require copying bits around - we just need to update some indices in DynamoDB. This script finds all entries in the store and upload tables for a space and creates new entries for each of those items in the new space. This should result in the new space being functionally identical to the old

This is a somewhat sensitive operation - we should only do this when we trust the customer a great deal - the contents of a particular space may be sensitive and this is a potential attack vector to discover them.

also clean up and test

combined with the `copy-stores-and-uploads` command this enables space forks

we already record the "snapshot date" and the "recorded date" separately, so this works even better than I thought it would!