Noissue - adding deteck static analysis tool for Kotlin

As per the title, just adding the tool. It can be used by explicitly running ./gradlew detekt, it creates reports in <projectRoot>/build/reports/detekt/. By now, we have too many errors detected to make this part of the pre-commit hook or CI: we can create a tickets to reduce the problems to 0 or add a baseline configuration to ignore the existing problems and later address them one by one.