Distribute Enola JARs as Maven artefacts

[vorburger]

https://github.com/bazel-contrib/rules_jvm_external/blob/master/docs/api.md#java_export (and an example)

https://docs.jitpack.io/building/#custom-commands

https://docs.jitpack.io/#javadoc-publishing would be very neat for #491

(From jitpack/jitpack.io#3129)

[vorburger]

With PR TBD:

• bazel-bin/java/dev/enola/enola.publish-publisher is a script to publish dev.enola:enola:main-SNAPSHOT to a repo?
• bazel-bin/java/dev/enola/enola-pom.xml is a pom.xml (without version number?!)
• bazel-bin/java/dev/enola/enola-project.jar (and enola-project-src.jar) are "über-JARs"

BTW: With dev.enola:enola:main-SNAPSHOT, the <version> was empty (thus using 0.0.1-SNAPSHOT now).

But these are not in the "Maven repo layout" ?! Hm, how to launch that enola.publish-publisher script...

[vorburger]

#974 lays the foundation for this!

That PR technically does not actually "distribute" anything just yet, but (best case) that will be trivial, after merging...

[vorburger]

That PR technically does not actually "distribute" anything just yet, but (best case) that will be trivial, after merging...

NOK, as described on jitpack/jitpack.io#3129 (comment).