QUARKUS-2481 - Allow to provide custom configuration for JAXB context

JIRA link: https://issues.redhat.com/browse/QUARKUS-2481

Allows to the end user to provide a custom JAXBContext configuration

Documentation: https://quarkus.io/guides/resteasy-reactive#advanced-jaxb-specific-features Related to: QUARKUS-2019

Scope of the testing

Review upstream coverage
Review corner cases and possible security vulnerabilities
Test development in case of missing test coverage

Getting familiar with the feature

Following actions were taken to ensure familiarity:

Focus on exploratory testing of the feature

Automated test development

No need for additional test coverage, PR with the feature is well done.
https://github.com/quarkusio/quarkus/pull/25801/files contains reasonable feature coverage

Advanced topics for test development

N/A

Contacts

Tester: Pablo Gonzalez Granados pagonzal@redhat.com