Reports incorrect @EventListener methods.

Example:

  @Configuration @ComponentScan
  open class Config

  data class MyEvent(val string: String)

  @Component
  class LogComponent {
    @EventListener // Method annotated with @EventListener must be public
    private fun logCommands(commandName: MyEvent) {}

    @EventListener // Method must have maximum one parameter
    fun processCommand(commandName: MyEvent, text: String) {}
  }