ArC: add ability to initialize synthetic beans eagerly

[edeandrea]

Description

Currently when creating a bean via SyntheticBeanBuildItem.ExtendedBeanConfigurator there is no way to mark that bean as @Startup. This would be a good idea.

This idea came from this conversation: https://quarkusio.zulipchat.com/#narrow/stream/187038-dev/topic/Way.20to.20mark.20bean.20as.20Startup.3F

Implementation ideas

No response

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[quarkus-bot]

/cc @Ladicek (arc), @manovotn (arc)

[edeandrea]

Something like this would be great!

SyntheticBeanBuildItem.configure(SOME_BEAN)
  .defaultBean()
  .scope(ApplicationScoped.class)
  ...
  .makeStartup()
  ...
  .done()

Maybe synthetic bean is the wrong word/term, but some way to produce some kind of build item which is marked as @Startup.