(WIP) Fix #887: use module-info.java directly

[cowtowncoder]

So, fix #887 by adding 2 module-info.javas like for other modules.

[cowtowncoder]

Not quite working yet: seems like build is working, but test build has an issue: odd failure

[ERROR] Failed to execute goal org.jetbrains.kotlin:kotlin-maven-plugin:1.9.25:test-compile (test-compile) on project jackson-module-kotlin: Compilation failure
[ERROR] Module junit cannot be found in the module graph

given that junit is for JUnit 4 which is not used by Kotlin module (JUnit 5, jupiter, is).

Hopefully can figure it out and this is done.

[cowtowncoder]

Ok. So, no matter what I do, it looks like only "regular" module-info.java from src/main/java/ takes effect: one from src/test/java (for tests not so much). All the instructions I have seen suggest adding it under java dirs (not kotlin). I have tried adding source directory config for Maven plug-ins and all, in vain. Almost ready to give up...