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This commit adds support for KMS master key versions. Now, MinIO stores any key version information returned by the KMS as part of the object metadata. The key version identifies a particular master key within a master key ring. When encrypting/ generating a DEK, MinIO has to remember the key version - similar to the key name. When decrypting a DEK, MinIO sends the key version to the KMS such that the KMS can identify the exact key version that should be used to decrypt the object. Existing objects don't have a key version. Hence, this field will be empty. Signed-off-by: Andreas Auernhammer <github@aead.dev>