Data being sent to Lua Script and data being returned to Lua Script

Server also needs to return some kind of a score in the body of the response and without new line and so (just a score probably in a form of a integer), at least Lua script is expecting it. Should be noted in the documentation.

_Originally posted by @azurit in https://github.com/coreruleset/machine-learning-integration-plugin/pull/1#discussion_r962857902_