How do I get the TransferState of e.g. Copy in the new TransferManager?

[charlesritchea]

In v1 I could get the com.amazonaws.services.s3.transfer.TransferState to determine whether the copy was in progress, had been cancelled, or errored. The only method I could come up was to pair the copy with it's TransferListener and record that state there. Even the ability to get the TransferListener from the Copy would make this easier

[charlesritchea]

Or maybe it can be determined from the snapshot, but there are like a hundred SdkResponse sub-types