Consider building a variant for quarkus

[AB-xdev]

Priority: low

From xdev-software/vaadin-date-range-picker#352:

Maybe you like to build a jandex natively into your addon?

I don't think we should currently do this as

• we don't see a lot of Quarkus usage
• the index will increase the JAR size and will be useless for e.g. Spring users as Spring uses a different indexing process

Maybe we can do a release variant (e.g. 1.2.3-quarkus) in the future but for now I don't think it's worth it.