Community build: add cats and update cats-effect

[griggt]

An alternative to #10587.

Updates cats-effect-2 and cats-effect-3 in the community build to latest upstream. Rather than modifying upstream to use withDottyCompat as was done in #10587, here we add the dependencies to the community build.

Projects added:

Name	Reason
cats
discipline	dependency of cats
discipline-munit	dependency of cats and cats-effect-2
discipline-specs2	dependency of cats-effect-3
simulacrum-scalafix	dependency of cats
cats-mtl	transitive dependency of cats-effect-3
coop	dependency of cats-effect-3

Fixes #10478

[smarter]

LGTM, this is super useful, thank you!

[smarter]

I find it weird that running JS tests can exhaust the JVM heap, wdyt @sjrd ? Tests should be running using node and not rhino right?

[griggt]

The GC thrashing seems to be triggered by:

[info] Full optimizing /src/dotty/community-build/community-projects/cats/tests/.js/target/scala-3.0.0-M2/cats-tests-test-opt
[info] Full optimizing /src/dotty/community-build/community-projects/cats/js/target/scala-3.0.0-M2/cats-js-test-opt
[info] Full optimizing /src/dotty/community-build/community-projects/cats/alleycats-tests/js/target/scala-3.0.0-M2/alleycats-tests-test-opt
[info] Fast optimizing /src/dotty/community-build/community-projects/cats/free/.js/target/scala-3.0.0-M3/cats-free-test-fastopt

[griggt]

Disabling full optimization for the Scala.js tests in cats seems to have solved the GC thrashing issue.

On another note, we'll need to fork all the added projects to dotty-staging if we want to merge this.

[smarter]

On another note, we'll need to fork all the added projects to dotty-staging if we want to merge this.

Ah yes, I think you should be able to create the forks since you're a member of the org.

[smarter]

Disabling full optimization for the Scala.js tests in cats seems to have solved the GC thrashing issue.

Until/unless this is merged upstream, we could do this in the community build config itself with set scalaJSStage in Global := FastOptStage so we don't have to diverge from upstream in the submodule.

[griggt]

since you're a member of the org.

am I? I only see collaborator access on dotty-staging/cats-effect, and am not seeing the option to fork to the dotty-staging org.

[smarter]

Oops I thought you did, you should have access now.

[smarter]

Dotty CI / community_build_b (pull_request) Successful in 71m

This is now much longer than community_build_a, maybe we should move some other projects to _a to balance things out?