publish sources of synthetic classes and types in -sources.jar artefacts

[unkarjedy]

Similar to scala/bug#12958 but for Scala 3 synthetic classes.

Those classes are already published for docs (examples: AnyKind, Matchable)
It would be nice to publish in sources to be able to see their description in the IDE

Related:
https://youtrack.jetbrains.com/issue/SCL-22350
https://youtrack.jetbrains.com/issue/SCL-22167

Full list of classes

• AnyKind
• Matchable
• &
• |

[unkarjedy]

Related question.
Should Scala 3 repo duplicate ScalaDoc for Scala 2 synthetic classes?
Scala 3 repo: https://github.com/scala/scala3/blob/release-3.4.1/compiler/src/dotty/tools/dotc/core/Definitions.scala#L2446
Scala 2 repo: https://github.com/scala/scala/tree/2.13.x/src/library-aux/scala

[unkarjedy]

Also, it seems like ContextFunctionN classes could be published for Scala 3 in the same way it's done for ProductN, FunctionN and TupleN classes in Scala 2