Allow transitioning Scala version with scala_version
attribute of rules
#1569
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Description
Implements transition and exposes it via the
scala_version
attribute for a number of common rules.No effect at the moment, as for now we have only one valid setting.
After allowing more Scala versions when configuring rules repository, this will become the central part of the cross-build.
Motivation
Originally #1290.
Partitioned from #1552.