QUARKUS-1164 - Tech Preview Support for Oracle JDBC Extension

JIRA link: https://issues.redhat.com/browse/QUARKUS-1164

Initial analysis: https://issues.redhat.com/browse/QUARKUS-1164?focusedCommentId=18935716&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-18935716

https://quarkus.io/guides/datasource

Oracle datasource using jdbc-oracle extension.

Scope of testing

Connect to a database and persist data using Hibernate ORM with Panache.

Existing tests

jpa-oracle module in Quarkus upstream: https://github.com/quarkusio/quarkus/tree/main/integration-tests/jpa-oracle
- CRUD operations.
- Invocation of a DB procedure.

Automated test development

Add Oracle scenario into existing module sql-db/sql-app in https://github.com/quarkus-qe/quarkus-test-suite/tree/main/sql-db/sql-app.
Add a quickstart - submit an issue to create a dedicated quickstart module.
Documentation at https://quarkus.io/guides/datasource
- https://quarkus.io/guides/datasource#jdbc-url - the section is missing a description of the Oracle JDBC URL schema and a link to Oracle documentation.
- Submit an issue to amend the document.

Impact on test suites and test environment

Both upstream integration tests and planned Oracle scenario in sql-db/sql-app use OracleDB 18 express edition (gvenzl/oracle-xe:18.4.0-slim). This container takes several minutes to boot and is 2.5 GB at download time. Affected test suites:
- 1 new scenario in QE TS
- 1 new quickstart