Add support for Registering Junit5 Extensions Automatically

[yschimke]

The Junit5 support obviously supports @ExtendWith

native-build-tools/common/junit-platform-native/src/main/java/org/graalvm/junit/platform/config/jupiter/JupiterConfigProvider.java

Line 120 in af8131c

AnnotationUtils.registerClassesFromAnnotationForReflection(testClass, registry, ExtendWith.class, ExtendWith::value);

But doesn't seem to support Registering Extensions Automatically

https://www.petrikainulainen.net/programming/testing/introduction-to-junit-5-extensions/

Setting

-Djunit.jupiter.extensions.autodetection.enabled=true

and

Registering the extension via META-INF/services

[vjovanov]

We are already working on this under #613. We will take this use-case into account as well. Thanks for reporting!