Register Severity enum for reflection to support native applications that use gcp logging

[wabrit]

I'm using version 2.11.0 of the quarkus-google-cloud-logging quarkiverse extension so that I can log to GCP.

Logging works as expected for non-native Quarkus applications, but in native all logs appear with DEFAULT severity in GCP console rather than INFO, DBUG etc.

This is because the LoggingHandler#transform method uses Gson to serialize a value of the com.google.cloud.logging.Severity enum, and in native builds this always serializes to null unless that class is registered for reflection.

Rather than rely on applications to do this, the quarkus google cloud logging extension should ensure that the enum is registered with ReflectiveClassBuildItem in the processor (presumably as a @BuildStep annotated method of the LoggingBuildSteps class).

[loicmathieu]

Thanks for the issue, this is easy to fix, as you have it sorted out maybe you want to propose a PR?
Otherwise I'll take care of it.

[wabrit]

Hi @loicmathieu - I'm happy to have a go at this one, given that it looks like just a few additional lines.

[loicmathieu]

Great! Thank you!

[wabrit]

Pull request submitted - apologies I wasn't sure how (or whether) I should do things like assigning the issue to me, link the branch/PR to this issue (or vice-versa).

[loicmathieu]

Fixed by #679