internal: Use Scala 3 by default for sbt and IntelliJ #3137
+32
−40
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As the primary development has moved to Scala 3, adding Scala 3 source code (scala-3) to the IntelliJ project is better for daily development. We still need to support Scala 2 for a while, but we don't have so many Scala 2 specific source code (scala-2 folder). This change is to let IntelliJ recognize scala-3 source code folder to enable syntax highlight, etc.