catostrophe

The first step towards Scala 3 for any real-world project is cross-compilation between Scala 2.13/Scala 3. Most of the OSS libs added Scala 3 to their cross-builds. IMO, this will...

@ReiReiRei attn

I tried [.scalafmt.conf](https://github.com/7mind/izumi/blob/develop/.scalafmt.conf) from Izumi repo. Liked the result, but I would suggest a few changes: * `maxColumn = 120` * drop `newlines.alwaysBeforeCurlyBraceLambdaParams = true`

We definitely need interop, and we already have it. But it's not published and I am not sure if the main repo is a right place for it.

Btw, I managed to make all tests work on Scalatest. Do we really need to make such a huge migration?

I mean, if we start the migration to MUnit now, we'll have to do it in both branches - `master` and `CE3`.

Let's plan the version number, e.g. `0.10.0` for the last CE2 release and make a branch for it. If we need to do a hotfix we can release it for...

If anyone decides to take this issue, this should be done in a separate repo. Ping me or @janstenpickle to create a fresh repo in trace4cats org.

@mrdziuban thanks! sure, I will create a repo today and let you know!

@mrdziuban welcome to the new project: https://github.com/trace4cats/trace4cats-xray