Leverage pipelining when batching SQL statements

The two concepts are closely related, but it's unclear if we integrate them at this moment. Maybe we do, in which case addressing this is as easy as documenting (if necessary) and closing the issue.

See:

https://docs.jboss.org/hibernate/orm/current/userguide/html_single/Hibernate_User_Guide.html#batch-jdbcbatch
https://quarkus.io/guides/reactive-sql-clients#pipelining