feat(core): Add DefaultConfiguratorFactory for JBoss Log Manager 3.x.

Change-Id: I6bf88c9e6c8c4aba303cc1d18e8f18c917dd6b88
diff --git a/examples/spring-boot/src/main/resources/logging.properties b/examples/spring-boot/src/main/resources/logging.properties
index 31aebd7..8bc0033 100644
--- a/examples/spring-boot/src/main/resources/logging.properties
+++ b/examples/spring-boot/src/main/resources/logging.properties
@@ -2,5 +2,11 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-handlers = eu.mulk.quarkus.googlecloud.jsonlogging.logmanager.DefaultConsoleHandler
-.level = INFO
+# java.util.logging properties
+#handlers = eu.mulk.quarkus.googlecloud.jsonlogging.logmanager.DefaultConsoleHandler
+#.level = INFO
+
+# JBoss Log Manager properties
+logger.level = INFO
+logger.handlers = GOOGLEJSON
+handler.GOOGLEJSON = eu.mulk.quarkus.googlecloud.jsonlogging.logmanager.DefaultConsoleHandler