Download source artifacts for all library artifacts from plugin dependency

[YannCebron]

when depending on Kotlin plugin:

For some platform types I get decompiled sources instead of actual sources. For example, PsiFile works, but psiFile.findDescendantOfType does not. The latter seems to come from PsiUtilsKt from Kotlin-compiler-for-ide

note this is different from #349 and #786 since it affects all possible bundled (3rd party) libraries distributed with plugin

original issue: https://youtrack.jetbrains.com/issue/IDEA-281457