Implement Oracle datasource quickstart

[jsmrcka]

Add a quickstart that shows Quarkus datasource functionality using the Oracle datarouce (quarkus-jdbc-oracle). Majority of the quickstarts use PostgreSQL (quarkus-jdbc-postgresql) and there is a lack of examples of other datasources.

It could be e.g. an analog of hibernate-orm-quickstart/hibernate-orm-panache-quickstart with postgresql swapped for oracle.

[rbaumgar]

@jsmrcka I created an Oracle version of the getting-started-reactive-crud. See https://github.com/rbaumgar/oracle-db-operator-openshift/tree/main/getting-started-reactive-crud-oracle

[rbaumgar]

@Quarkus should I create a PR?