Documentation gap fo extension authors guide: Configuration Value Types lacks java.time.*

[ge0ffrey]

The configuration convertors in this list:
https://quarkus.io/guides/extension-authors-guide#configuration-value-types
Do not mention java.time.Duration or any of the other java.time.* classes.

However, Guillaume confirmed it is supported, so java.time.Duration (and potentially other java.time.* classes) should be added to that list.

[ge0ffrey]

Related:
"I don't think it's the only one missing so we need to take a step back and fill in the gaps"