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This commit adds missing fields to GetRecords responses: `awsRegion` and `eventVersion`. We also considered changing `eventSource` from `scylladb:alternator` to `aws:dynamodb` and setting `SizeBytes` subfield inside the `dynamodb` field. We set `awsRegion` to the datacenter's name of the node that received the request. This is in line with the AWS documentation, except that Scylla has no direct equivalent of a region, so we use the datacenter's name, which is analogous to DynamoDB's concept of region. The field `eventVersion` determines the structure of a Record. It is updated whenever the structure changes. We think that adding a field `userIdentity` bumped the version from `1.0` to `1.1`. Currently, Scylla doesn't support this field (#11523), hence we use the older 1.0 version. We have decided to leave `eventSource` as is, since it's easy to modify it in case of problems to `aws:dynamodb` used by DynamoDB. Not setting `SizeBytes` subfield inside the `dynamodb` field was dictated by the lack of apparent use cases. The documentation is unclear about how `SizeBytes` is calculated and after experimenting a little bit, I haven't found an obvious pattern. Fixes: #6931 Closes scylladb/scylladb#24903