Support --java-opt / -J for compile task under --server=false

[lrytz]

It would be handy if scala-cli compile --server=false supported -J options, they would be passed to the JVM running the compiler.

Use case is opening a debugger port (scala-cli compile --server=false -J-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 Test.scala).

Workaround is to use --scalac-option -J-...

➜ sandbox scala-cli compile --server=false -S 2.13 T.scala -O -J-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005
Listening for transport dt_socket at address: 5005

That was added in https://github.com/VirtusLab/scala-cli/pull/2601/files, but it seems a bit strange. scalac -J... is supported by the old runner script, not by the compiler itself.

[Gedochao]

Optimally, we should have a dedicated option for Java opts passed to the compiler alongside --server=false for better UX, similar to how we have --bloop-java-opt for Java opts passed to Bloop with --server=true (the default).
Probably something like --compiler-java-opt.

It is somewhat unexpected this feature is delivered via --scalac-option -J* (but it indeed works this way right now, as delivered by #2601).