Inconsistent behavior of batches

[eperott]

When a batch of updates is created manually (e.g. in cqlsh), the full batch will be logged as one single audit record. However, if a prepared batch is executed, then individual records will be created for the different operations in the batch (and correlated with a batch id).

This behavior is not consistent and will confuse users. We should investigate if we can get separated batch entries always.

FWIW, the same behavior is present in Cassandra 4.0.