Support SIP-68: Reference-able Package Objects
#676
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Follow up to https://github.com/JetBrains/intellij-scala/pull/672/files. SIP-68 has been approved for experimental use, and will probably become preview/final at some point later, so opening this PR to get ready for that.
Not sure if there's a better way to do this, e.g. if we want to continue supporting the older behavior for older Scala versions. This is just a first draft to start the discussion