Promote ruleops-core to a quarkus extension

[lucamolteni]

Original idea: #27 (review)

"we have "a rule base".

mvn quarkus-plugin including ruleops extension
copy "rule base" inside
done.
that would help codegenerate the main version with meaningful help/options (by inspecting the rulebase in the extension)

Same consideration for the topic of #23