rclone should check if data is encrypted the same to allow server side copy/move operations

[pintassilgo]

The associated forum post URL from https://forum.rclone.org

https://forum.rclone.org/t/server-side-across-configs-should-be-ignored-when-copying-moving-from-crypt-to-crypt/41975

What is the problem you are having with rclone?

I did a server side copy between remotes with different encryption and rclone allowed it without any warnings, but of course this produced corrupted files because server side copy doesn't change file data to comply with remote encryption.

rclone should only allow server side copy/move operations if source and dest have the same encryption.