Update build process

[RickMoynihan]

This is a low priority issue.

Currently this project uses leiningen to build an uberjar; though we don't deploy the library to clojars, and we consume it as a library in most places via tools.deps :git/sha.

This ticket is a bit of an epic covering multiple things around this project and its builds.

1. I don't think we currently consume this as an app in many places; but if we still want to serve that use case we should probably do so by generating graalvm native-images, rather than running via java -jar.
2. If we want to generate graal builds we should probably drop lein in its entirety, and move to tools.build (maybe also babashka).