Add Duration.toCoarsest method
Merge pull request #2561 from soc/SI-7479

SI-7479 Make test/files/run/tailcalls.scala pass on Avian
Merge pull request #2602 from t3hnar/Duration.toCoarsest

Add Duration.toCoarsest method
SI-6811 Split scala.util.parsing and move it to its own jar
SI-6811 Migrate usages of s.t.n.u.CommandLineParser to s.t.c.Parser