QUARKUS-1255 Dev support for JaCoCo extension

JIRA link: https://issues.redhat.com/browse/QUARKUS-976
Quarkus Guide: https://quarkus.io/guides/tests-with-coverage
Release blog post: https://quarkus.io/blog/quarkus-1-13-0-final-released/#test-coverage-reports

Scope of the testing

Focus on exploratory testing of the feature.
Extension has no impact on performance in production.
Small impact on test execution time as JaCoCo instruments classes to capture the coverage. On the other hand the same impact would be noted when JaCoCo is used directly, quarkus-jacoco extension makes user experience much nicer.
No impact for compatibility, extension is not used in application code.

Focus on exploratory testing of the feature
Experiment with the extension using single module maven project generated using code.quarkus
Experiment with the extension using several modules in Quarkus integration tests
Experiment with the extension using standalone Maven project with several modules
- https://github.com/rsvoboda/multi-module-jacoco/tree/multiple-app-modules
Experiment with the extension using standalone Maven project with several test modules
- https://github.com/rsvoboda/multi-module-jacoco/commit/ff78b19e88abd94df438d0e3566d89c784aabc23
Get aggregated report from all the modules available in Maven project
- https://github.com/rsvoboda/multi-module-jacoco/commit/fb07ba5881d066d92ac1c94c2ea924020d4829e7

New test to be added into Quarkus QE tests suite to cover scenario with quarkus-jacoco extension

The are no advanced topics to be checked as the extension is considered for Development support and its complexity is not high.