Support Bazel rules_kotlin's toolchain without legacy providers #6394
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Support Bazel rules_kotlin's toolchain without legacy providers
This is a prerequisite to finally turn down legacy struct providers. The last such instance is used in rules_kotlin. And it's used to serve as integration with IntelliJ.
After this change, PR bazelbuild/rules_kotlin#1157 may be merged, keeping rules_kotlin working with IntelliJ.
Legacy struct providers have been deprecated by Bazel. Replacing them with modern providers, will make it possible to simplify and remove legacy handling from Bazel.
More info on: https://bazel.build/extending/rules#migrating_from_legacy_providers
Issue: bazelbuild/bazel#19467