Integrate clj-kondo support

[esuomi]

There's a relatively new linter for Clojure, clj-kondo which has lately gained a lot of popularity among Clojure devs for being a very well thought out and comprehensive Clojure linting tool. It is also designed to be integrated quite easily, as is proven by its Editor Integration (clj-kondo) page.

However, things could be even better. While by default clj-kondo outputs mainly text describing linting problems, it also has a raw data analysis output mode which could be used as an excellent basis for eg. driving refactorings, live templates and whatever features provided natively by the IntelliJ platform. Of course just highlighting the correct parts of the file is a start, and quite close to what File Watchers already does, but using actual analysis data would open up a lot of paths for deeper IDE integration further along the way.