Deprecate log4j logger method in Plugin

patches/api/Allow-plugins-to-use-SLF4J-for-logging.patch

@@ -40,6 +40,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return org.slf4j.LoggerFactory.getLogger(getLogger().getName());
 +    }
 +
++    /**
++     * @deprecated use {@link #getSLF4JLogger()}
++     */
++    @Deprecated
 +    @NotNull
 +    default org.apache.logging.log4j.Logger getLog4JLogger() {
 +        return org.apache.logging.log4j.LogManager.getLogger(getLogger().getName());