Scala 3 Quarkus improvements to close the gap to Kotlin

[carlosedp]

With this issue, I'd like to list some gaps and improvements that could be done to the Quarkus / Scala ecosystem to bring it up to a similar level as Kotlin.

Some features are shown in my Scala 3 Quarkus quickstart project at: https://github.com/carlosedp/scala3-quarkus-quickstart/

Some Improvements:

• Create a Scala guide page in https://quarkus.io that could use as a base the readme of this extension
• Register the Scala Enum module in ObjectMapper when Jackson Scala module is added along the lines I did in https://github.com/carlosedp/scala3-quarkus-quickstart/blob/main/src/main/scala/helper/EnumJsonSerializationHelper.scala. I see the DefaultScalaModule is already added. Is it possible to also add the lib to avoid the user to add it?
  • Addressed by Bump Quarkus version to use latest Jackson lib. Update Readme. #36
• Is it possible to add scala3-compiler_3 to the extension so it's one less lib to add to Maven/Gradle user project?
• Add the RestAssured DSL to the module for ease-of-use?
  • Opened Create scala-extensions module for Scala 3 rest-assured/rest-assured#1770 to add the DSL to rest-assured
• Allow use of Scala Futures and Promises in Quarkus Resources
  - Addressed by Future[T] and Promise[T] as Controller ReturnTypes #51
• Allow use of Scala Zio effects in Quarkus Resources
  - Addressed by Support for ZIO as return type in Rest Resources #52

Current extensions published for Kotlin:

• Kotlin (which I understand provides the same functionality as this extension)
• Hibernate ORM with Panache and Kotlin
• Hibernate Reactive Panache Kotlin
• MongoDB with Panache for Kotlin
• REST Client Reactive Kotlin Serialization
• RESTEasy Reactive Kotlin Serialization
• RESTEasy Reactive Kotlin
• RESTEasy Reactive Kotlin Serialization Common
• Scheduler
• Smallrye Reactive Messaging

I understand these provide some abstractions to the underlying Java libraries to a more Kotlin-esque style. Could be done on a needed-basis.