Add an ability to publish kotlin-native-compiler-embeddable.jar and
sources to maven. Adds necessary for that sourcesJar and javadocJar
tasks. Note that Native distribution uses this jar without a version postfix.
Also cleaned up the obsolete backend.native publication and renamed
project to match its name.
Merge-request: KT-MR-12974
Merged-by: Pavel Punegov <Pavel.Punegov@jetbrains.com>
Pavel Punegov