feat: add script to copy stores and uploads to a new space

[travis]

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.

This has not been tested extensively, though I have run it in my development AWS env and it seems to work - we should do some validation that using this results in a new space that is functionally identical to the old.

@alanshaw particularly interested in your thoughts on whether this will mess up billing at all?

[seed-deploy[bot]]

View stack outputs

- **pr392-w3infra-BillingDbStack** Name | Value -- | -- customerTableName | pr392-w3infra-customer spaceDiffTableName | pr392-w3infra-space-diff spaceSnapshotTableName | pr392-w3infra-space-snapshot usageTable | pr392-w3infra-usage - **pr392-w3infra-BillingStack** Name | Value -- | -- ApiEndpoint | https://wcna1z8xyg.execute-api.us-east-2.amazonaws.com billingCronHandlerURL | https://mmerh6kycub5ek7s2hwn7ofo7u0rrqxw.lambda-url.us-east-2.on.aws/ CustomDomain | https://pr392.billing.web3.storage - **pr392-w3infra-CarparkStack** Name | Value -- | -- BucketName | carpark-pr392-0 Region | us-east-2 - **pr392-w3infra-RoundaboutStack** Name | Value -- | -- ApiEndpoint | https://ltgeehtd5a.execute-api.us-east-2.amazonaws.com CustomDomain | https://pr392.roundabout.web3.storage - **pr392-w3infra-UcanInvocationStack** Name | Value -- | -- invocationBucketName | invocation-store-pr392-0 taskBucketName | task-store-pr392-0 workflowBucketName | workflow-store-pr392-0 - **pr392-w3infra-UploadApiStack** Name | Value -- | -- ApiEndpoint | https://mldk9ku9f9.execute-api.us-east-2.amazonaws.com CustomDomain | https://pr392.up.web3.storage - **pr392-w3infra-BusStack** - **pr392-w3infra-FilecoinStack** - **pr392-w3infra-ReplicatorStack** - **pr392-w3infra-UcanFirehoseStack** - **pr392-w3infra-UploadDbStack**

[travis]

ok this is in good shape - my one remaining concern is how this will interact with billing - @hannahhoward maybe you have some insight since you've been in that code in the past few days?