Support .jar files in -d option

[Florian3k]

scalac allows putting .jar files in -d option. Invokingscalac file.scala -d foo.jar creates foo.jar file. scala-cli compile file.scala -d foo.jar creates foo.jar folder instead. I'd expect the same behavior of those two commands.

[kannupriyakalra]

@Florian3k @Gedochao Hi Fornal/Piotr, I worked on this issue last weekend, could you please assign the issue to me and help review the PR for it- https://github.com/VirtusLab/scala-cli/pull/2943

[Gedochao]

Fixing this properly is rather tricky, so I'm removing the spree label.

[lrytz]

-O -d -O out.jar doesn't help, scala-cli still intercepts it