IntelliJIDEA's support for simulacrum disabled in cats

[kailuowang]

IntelliJIDEA's support for simulacrum is disabled by this trick to enable compile-time-only dependency.

See discussion here.
https://youtrack.jetbrains.com/issue/SCL-13221

IntelliJ is a great tool to navigate the code base, without simulacrum support, it would be less useful in the Cats codebase.

3 Options I can see:

1. keep as is. wait for https://youtrack.jetbrains.com/issue/SCL-13221 to fix
2. document the issue so that user can temporarily comment out the % CompileTime when using IntelliJ IDEA with cats.
3. switch back to use % Provided and leave an issue to switch back when jetbrains adds support for it.

[jgogstad]

Is this related to other incorrect red squiggles issues with cats and IntelliJ?

"Good code highlighted in red using cats mapN": https://youtrack.jetbrains.com/issue/SCL-12892
"False error (good code red): sequence from cats": https://youtrack.jetbrains.com/issue/SCL-10259