Quarkus 3 now includes Jakarta EE which replaces the old Java EE classes
that were found within the `javax.*` package and are now in `jakarta.*`.
In addition, quarkus-boostrap-maven-plugin had been deprecated and is no
longer available, replaced with quarkus-extension-maven-plugin instead
with the CR1 release of Quarkus 3.
In order to avoid potential conflicts or problems with reusing the
same class names, this commit repackages all reactive code into a
separate io.debezium.outbox.reactive package rather than using the
same non-reactive package io.debezium.outbox.