Bump Gradle and Kotlin versions

[aSemy]

• Bump Gradle to 7.4.2
• Bump Kotlin to 1.7.0

I also refactored the Gradle scripts to be a little more idiomatic

• dependencies defined in 'common', if they are platform-independent, are inherited by JS and JVM automatically
• change forEach to configureEach - uses Gradle lazy-config API
• set up central repo definition