* Exclude bytecode from skiko-awt-runtime-*.jar files

Previously, `skiko-awt.jar` and all of `skiko-awt-runtime-*.jar` files
contained the same bytecode. However, this led to duplication
of bytecode in Compose projects:
* `skiko-awt.jar` is a necessary API dependency of Compose/Desktop, which means
it is a runtime dependency as well;
* `skiko-awt-runtime-*.jar` is a necessary RUNTIME dependency of any Compose/Desktop project.

Thus, both `skiko-awt.jar` and `skiko-awt-runtime-*.jar` ended up in a runtime classpath of
any Compose/Desktop project, so the same classes were present in the runtime classpath twice.
This increased a final application image by approximately 1.1 Mb. Also, it led to
excessive ProGuard warnings, e.g. https://github.com/JetBrains/compose-jb/issues/2393

This change excludes bytecode from `skiko-awt-runtime-*.jar` artifacts, and adds
Maven dependency `skiko-awt-runtime-*.jar` -> `skiko-awt.jar`, so
many existing Maven/Gradle usages of `skiko-awt-runtime-*.jar` will continue to work.