Publish `lib` module jar as github package.

Right now running `./gradlew lib:build` builds the library in `lib/build/libs/lib.jar` 

Add maven publishing via github package so that it can be used via gradle dependency management. Add missing project info like:

* `groupId`: `hossain.dev`
* `artifactId`: `json5kt`
* `version`: `1.0.0`

If there is more info required make educated guesses and continue with implementation.