Add tests of serialization for all ZIO data types and make Promise serializable

[jakubjanecek]

Closes issue #1739

[ghostdogpr]

@jakubjanecek this test was just migrated to ZIO Test. Can you rebase on master and adapt the new tests?

[jakubjanecek]

@ghostdogpr I did rebase the code and converted the tests to zio-test. I do have a problem with ZTrace test which fails very strangely. I've tested serialization of ZTraceElement and Vector[ZTraceElement] and it works fine. The problem is with List[ZTraceElement] which fails on ClassNotFoundException on its own and when I try it as part of the ZTrace test it fails on java.lang.ClassCastException: cannot assign instance of scala.collection.immutable.List$SerializationProxy to field zio.ZTrace.executionTrace of type scala.collection.immutable.List in instance of zio.ZTrace. There is a serialization proxy pattern used in List and that seems to be the problem but I really have no idea how to solve the problem. Any help?

[ghostdogpr]

@neko-kai any idea about what's going on with ZTraceElement?

[dkarlinsky]

Adding this to sbt setting seems to resolve the ZTrace issue:

.settings( Compile / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.Flat )

This is from sbt/sbt#89

[jakubjanecek]

@dkarlinsky Thank you for your help!

@ghostdogpr This PR is now ready to be merged I think.

[LGLO]

Well done!

[ghostdogpr]

@jakubjanecek thanks!