Add support for multi-release jars for JDK9+

JEP 238 adds multi-release jars which allow a jar to contain multiple versions of a class depending on which version of the JVM/JDK is being used at runtime. This will help support for new APIs in JDK9+ so that we don't need to rely on reflection to access newer APIs dynamically. This is also useful in performance-critical sections (e.g., LOG4J2-1359).