Scala 3 support

[vigoo]

Resolves #225

[KacperFKorban]

This OOM is fixed on dotty/main, though not backported ATM.
A workaround for this is to add @unchecked to this line

zio-flow/zio-flow/shared/src/main/scala/zio/flow/debug/PrettyPrint.scala

Line 42 in cba392a

val _ = remote match {

like so:

val _ = (remote: @unchecked) match {

[vigoo]

This OOM is fixed on dotty/main, though not backported ATM. A workaround for this is to add @unchecked to this line

Thanks, nice to hear! But with sbt -mem 8192 it is not OOM but some macro tree check error.

[KacperFKorban]

I think that the macro check error is a different issue. It's an upstream bug in ZIO.
Without -Xcheck-macros, the runtime tests compile and run for me without any runtime errors.

I think that instead of adding -Xcheck-macros here, it should be added in zio/zio since that is where the macros are defined (and can be fixed).

[vigoo]

I think that instead of adding -Xcheck-macros here, it should be added in zio/zio since that is where the macros are defined (and can be fixed).

Interesting, thanks. Will do that. (This was not obvious to me from the error message at all.)

[vigoo]

So in ZIO adding -Xcheck-macros to the test project did not reveal any error, but anyway I will continue migrating this project by removing that flag for now.

[sideeffffect]

Just some build related suggestions from a random passer by. I hope you may find some of them helpful.
Thanks for working on zio-flow 🙇

[sideeffffect]

Suggested change

	val ScalaDotty: String = versions("3.3")
	val Scala3: String = versions("3")

You may then need to rename a couple of remaining uses of ScalaDotty.

[sideeffffect]

This should be removed. There are versions already defined in BuildHelper.scala.

[sideeffffect]

Why not lazy val?