Convert Load to Quarkus App

[karesti]

I have done in this PR:

• Convert to a Quarkus App
• Use Picocli. In reality a simple Quarkus main would be enough if the app remains this simple
• Change the code to use RestClient instead of custom rest api calls
• There aren't 3 threads, but 3 sequential calls randomly executed

Things to discuss here:

• I'm unable to stop the java class and I tried to find a proper way with picocli and I was unable to find one.
• RestClient methods should be "Uni" "Multi" for reactive ?
• Do we want to enhance this picocli application with more options ? Or should we simply have a Quarkus Main

Closes #100

[karesti]

@agoncal @holly-cummins questions here