Support Scala3 .tasty files

[timothyklim]

ijar tool support Kotlin modules by not stripped out files in META-INF/*.kotlin_module.
This PR add support for new Scala 3 (and Scala 2.13.4+) TASTy format to have ability to use Scala 3 modules.

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[timothyklim]

cc @philwo

[Jacke]

Hey guys @philwo You should check this MR, it's really important

[timothyklim]

cc @alandonovan

[philwo]

Thank you! This definitely looks like a tasty PR. 😋

I think there are no issues with merging it, the only question is, is this important enough to be cherry-picked into Bazel 4.0 LTS (= will the lack of it be an issue for Scala users going forward?).

[timothyklim]

Thank you! This definitely looks like a tasty PR.

I think there are no issues with merging it, the only question is, is this important enough to be cherry-picked into Bazel 4.0 LTS (= will the lack of it be an issue for Scala users going forward?).

I hope that 4.0 will include this patch and I'll continue to work on 3.0 support for rules_scala.

[alandonovan]

Code change looks fine to me. I didn't realize we still used ijar. I wrote parts of that in grad school nearly 20 years ago!