JS backend: add leftJetExpression and rightJetExpression fields into BinaryOperationTranslator
JS backend: add support for break, return, continue, throw in expressions
Minor, fix "J2K Tests" run configuration
Minor, add codegen test on extension to nested class
Introduce ClassDescriptor#getStaticScope()

Will be used to exterminate hacks related to static Java methods in our
codebase: synthetic class object for enum, synthetic package for static members
of Java classes, etc.
Rewrite Java resolve to use static class scope instead of synthesized packages
Minor, fix warnings and formatting in QualifiedExpressionResolver
Support static class scope in frontend, JVM codegen and plugin
Fix incorrect test data for wrong KotlinSignature CLI test

Classes from the root package cannot be referenced from a non-root package